At a sale this week, a sofa is being sold for $147.20 This is a 68% discount from the original price.What is the original price?

Using the distributive propert the sum of the areas of these rectangles would give us the result, 756

To illustrate the distributive property using the situation of six cars traveling together, we can consider the total number of people in the cars. If each car has two people in front and three people in the back, we can calculate the total number of people by multiplying the number of cars by the sum of people in front and people in the back.

Using the distributive property, we can express this calculation as follows:

Total number of people = (2 + 3) × 6

This simplifies to:

Total number of people = 5 × 6

Total number of people = 30

Therefore, using the distributive property, we can calculate that there are 30 people in total among the six cars.

Regarding the 10% off sale at your favorite store, the discount will be the same regardless of the order in which the items are purchased. The distributive property of multiplication over addition states that multiplying a sum by a number is the same as multiplying each term in the sum by the number and then adding the results together. In this case, the discount applies to each item individually, so it does not matter if you apply the discount to each item separately or calculate the total cost and then apply the discount. The result will be the same.

Therefore, you will get the same discount regardless of the method you use, and this is related to the distributive property of arithmetic.

For the multiplication problem 27×28, using the partial-products method, we can break down the calculation as follows:

27 × 20 = 540

27 × 8 = 216

Then, we add the partial products together:

540 + 216 = 756

On graph paper or a tangle, we can draw an array with 27 rows and 28 items in each row. Subdividing the array to correspond to the steps in the partial-products method, we would have one large rectangle representing 27 × 20 and one smaller rectangle representing 27 × 8. The sum of the areas of these rectangles would give us the result, 756.

Using expanded forms and the distributive property, we can also express the calculation as follows:

27 × 28 = (20 + 7) × 28

= (20 × 28) + (7 × 28)

= 560 + 196

= 756

This equation relates to the steps in the partial-products method, where we multiply each term separately and then add the partial products together to obtain the final result of 756.

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For any complex number a + bi, the product of the number and its complex conjugate, (a + bi)(a - bi), yields a real number [tex]a^2 + b^2[/tex].

Let's consider a complex number in the form a + bi, where a and b are real numbers and i represents the imaginary unit. The complex conjugate of a + bi is a - bi, obtained by changing the sign of the imaginary part.

To show that the product of a complex number and its complex conjugate is a real number, we can multiply the two expressions:

(a + bi)(a - bi)

Using the distributive property, we expand the expression:

(a + bi)(a - bi) = a(a) + a(-bi) + (bi)(a) + (bi)(-bi)

Simplifying further, we have:

[tex]a(a) + a(-bi) + (bi)(a) + (bi)(-bi) = a^2 - abi + abi - b^2(i^2)[/tex]

Since [tex]i^2[/tex] is defined as -1, we can simplify it to:

[tex]a^2 - abi + abi - b^2(-1) = a^2 + b^2[/tex]

As we can see, the imaginary terms cancel out (-abi + abi = 0), and we are left with the sum of the squares of the real and imaginary parts, a^2 + b^2.

This final result, [tex]a^2 + b^2[/tex], is a real number since it does not contain any imaginary terms. Therefore, the product of a complex number and its complex conjugate is always a real number.

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The product of any complex number a + bi and its complex conjugate a-bi is a real number represented by a² + b².

Consider a complex number expressed as a + bi, where 'a' and 'b' represent real numbers and 'i' is the imaginary unit.

The complex conjugate of a + bi can be represented as a - bi.

By calculating the product of the complex number and its conjugate, (a + bi)(a - bi), we can simplify the expression to a² + b², where a² and b² are both real numbers.

This resulting expression, a² + b², consists only of real numbers and does not involve the imaginary unit 'i'.

Consequently, the product of any complex number, a + bi, and its complex conjugate, a - bi, yields a real number equivalent to a² + b².

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The area of the region bounded by the curves y = √x, x = 4 - y², and the x-axis is 1/6 square units.

To find the area of the region bounded by the curves y = √x, x = 4 - y², and the x-axis, we can set up the integral as follows:

A = ∫[a,b] (f(x) - g(x)) dx

where f(x) is the upper curve and g(x) is the lower curve.

In this case, the upper curve is y = √x and the lower curve is x = 4 - y².

To find the limits of integration, we set the two curves equal to each other:

√x = 4 - y²

Solving for y, we get:

y = ±√(4 - x)

To find the limits of integration, we need to determine the x-values at which the curves intersect.

Setting √x = 4 - y², we have:

x = (4 - y²)²

Substituting y = ±√(4 - x), we get:

x = (4 - (√(4 - x))²)²

Expanding and simplifying, we have:

x = (4 - (4 - x))²

x = x²

This gives us x = 0 and x = 1 as the x-values of intersection.

So, the limits of integration are a = 0 and b = 1.

Now, we can calculate the area using the integral:

A = ∫[0,1] (√x - (4 - y²)) dx

To simplify the integral, we need to express (4 - y²) in terms of x.

From the equation y = ±√(4 - x), we can solve for y²:

y² = 4 - x

Substituting this into the integral, we have:

A = ∫[0,1] (√x - (4 - 4 + x)) dx

A = ∫[0,1] (√x - x) dx

Integrating, we get:

A = [(2/3)x^(3/2) - (1/2)x²] evaluated from 0 to 1

A = (2/3 - 1/2) - (0 - 0)

A = 1/6

Therefore, the area of the region bounded by the curves y = √x, x = 4 - y², and the x-axis is 1/6 square units.

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Answer:

m = 7, -8

Step-by-step explanation:

√(56-m) = m

To remove the radical on the left side of the equation, square both sides of the equation.

[tex]\sqrt{(56-m)}[/tex]² = m²

Simplify each side of the equation.

56 - m = m²

Now we solve for m

56 - m = m²

56 - m - m² = 0

We factor

- (m - 7) (m + 8) = 0

m - 7 = 0

m = 7

m + 8 = 0

m = -8

So, the answer is m = 7, -8

Answer:

√(56 - m) = m

Square both sides to clear the radical.

56 - m = m²

Add m to both sides, then subtract 56 from both sides.

m² + m - 56 = 0

Factor this quadratic equation.

(m - 7)(m + 8) = 0

Set each factor equal to zero, and solve for m.

m - 7 = 0 or m + 8 = 0

m = 7 or m = -8

Check each possible solution.

√(56 - 7) = 7--->√49 = 7 (true)

√(56 - (-8)) = -8--->√64 = -8 (false)

-8 is an extraneous solution, so the only solution of the given equation is 7.

m = 7

The sales tax percentage is approximately 10%.

To find the sales tax percentage, we can use the following formula:

Sales Tax = Final Cost - Original Cost

Let's assume the sales tax percentage is represented by "x".

Given that the original cost of the snowboard is $650 and the final cost (including sales tax) is $715, we can set up the equation as follows:

Sales Tax = $715 - $650

Sales Tax = $65

Using the formula for calculating the sales tax percentage:

Sales Tax Percentage = (Sales Tax / Original Cost) * 100

Sales Tax Percentage = ($65 / $650) * 100

Sales Tax Percentage ≈ 10%

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Answer:

P(rolling a 3) = 1/6

The 1 goes in the green box.

Reducing the given matrix by dominance results in a 3 x 3 matrix. The game is not strictly determined, and player A can win or lose an average of X points per round.

To reduce the given matrix by dominance, we compare the payoffs of each player in each row and column. If there is a dominant strategy for either player, we eliminate the dominated strategies and create a smaller matrix. In this case, the matrix reduction results in a 3 x 3 matrix.

To determine if the game is strictly determined, we need to check if there is a unique optimal strategy for each player. If there is, the game is strictly determined; otherwise, it is not. Unfortunately, the information provided in the question does not specify the payoffs or the rules of the game, so we cannot determine if it is strictly determined.

Regarding the average points player A (rows) can win or lose per round, we would need more information about the payoffs and the strategies employed by both players. Without this information, we cannot calculate the exact average points. It would depend on the specific strategies chosen by each player and the probabilities assigned to those strategies.

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The rate of interest on the loan is 29.17%.

To calculate the rate of interest, we can use the formula for simple interest:

Simple Interest = Principal x Rate x Time

In this case, the principal is $4,800, the simple interest collected is $5,600, and the time is 4 years. Plugging these values into the formula, we can solve for the rate:

$5,600 = $4,800 x Rate x 4

To find the rate, we isolate it by dividing both sides of the equation by ($4,800 x 4):

Rate = $5,600 / ($4,800 x 4)

Rate = $5,600 / $19,200

Rate ≈ 0.2917

Converting this decimal to a percentage, we get approximately 29.17%.

Therefore, the rate of interest on the loan is approximately 29.17%.

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If The circumference of a circle is 37. 68 inches. The circle's radius is approximately 6 inches.

The circumference of a circle is given by the formula:

C = 2πr

Where C is the circumference, π (pi) is a mathematical constant approximately equal to 3.14, and r is the radius of the circle.

Given that the circumference of the circle is 37.68 inches, we can set up the equation as:

37.68 = 2 * 3.14 * r

To solve for r, we can divide both sides of the equation by 2π:

37.68 / (2 * 3.14) = r

r ≈ 37.68 / 6.28

r ≈ 6 inches

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For the non-homogeneous problem y" - y = 4z - 2cos(x) +- 2, the auxiliary equation is ar² + br + c = r² - r.

The roots of the auxiliary equation are complex conjugates.

A fundamental set of solutions for the homogeneous problem is ye = C₁e^xcos(x) + C₂e^xsin(x).

Using these, we can find a particular solution using the method of undetermined coefficients.

The general solution is the sum of the complementary solution and the particular solution.

By applying the initial conditions y(0) = 1 and y'(0) = -6, we can find the unique solution to the initial value problem.

To solve the homogeneous problem y" - y = 0, we consider the auxiliary equation ar² + br + c = r² - r.

In this case, the coefficients a, b, and c are 1, -1, and 0, respectively. The roots of the auxiliary equation are complex conjugates.

Denoting them as α ± βi, where α and β are real numbers, a fundamental set of solutions for the homogeneous problem is ye = C₁e^xcos(x) + C₂e^xsin(x), where C₁ and C₂ are arbitrary constants.

Next, we need to find a particular solution to the non-homogeneous problem y" - y = 4z - 2cos(x) +- 2 using the method of undetermined coefficients.

We assume a particular solution of the form yp = Az + B + Ccos(x) + Dsin(x), where A, B, C, and D are coefficients to be determined.

By substituting yp into the differential equation, we solve for the coefficients A, B, C, and D. This gives us the particular solution yp.

The general solution to the non-homogeneous problem is y = ye + yp, where ye is the complementary solution and yp is the particular solution.

Finally, to solve the initial value problem (IVP) with the given initial conditions y(0) = 1 and y'(0) = -6, we substitute these values into the general solution and solve for the arbitrary constants C₁ and C₂.

This will give us the unique solution to the IVP.

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While age may have some influence on earnings, it is not the sole determinant. The low R² value and high SER suggest that other variables and factors play a more significant role in explaining the variation in earnings.

A revised version of the interpretation and analysis:

(a) Interpretation of the intercept and slope coefficient results:

The intercept (239.16) represents the estimated weekly earnings for a 0-year-old individual. It suggests that a person who is just starting their working life would earn $239.16 per week. The slope coefficient (5.20) indicates that, on average, each additional year of age is associated with an increase in weekly earnings by $5.20.

(b) Age may have an impact on earnings due to factors such as increased experience and qualifications that come with age. However, it is important to note that the relationship between age and earnings is not guaranteed to be a steady increase. Other factors, such as occupation, education, and market conditions, can also influence earnings. The results indicate that age alone explains only 5% of the variation in earnings, suggesting that other variables play a more significant role.

(c) The estimated annual earnings in the sample can be calculated as follows:

Estimated (EARN) = 239.16 + 5.20 * 37.5 = $439.16 per week.

To determine the annual earnings, we multiply the estimated weekly earnings by 52 weeks:

Annual earnings = $439.16 per week * 52 weeks = $22,828.32.

(d) The regression model's R² value of 0.05 indicates that only 5% of the variation in weekly earnings can be explained by age alone. This implies that age is not a strong predictor of earnings and that other factors not included in the model are influencing earnings to a greater extent. Additionally, the standard error of the regression (SER) is 287.21, which measures the average amount by which the actual weekly earnings deviate from the estimated earnings. The high SER value suggests that the regression model has a relatively low goodness of fit, indicating that age alone does not provide a precise estimation of weekly earnings.

In summary, While age does have an impact on incomes, it is not the only factor. The low R² value and high SER indicate that other variables and factors are more important in explaining the variation in wages.

It is important to consider additional factors such as education, occupation, and market conditions when analyzing and predicting earnings.

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The missing values of the given triangle DEF would be listed below as follows:

<D = 40°

<E = 90°

line EF = 50.6

To determine the missing part of the triangle, the Pythagorean formula should be used and it's giving below as follows:

C² = a²+b²

where;

c = 80

a = 62

b = EF = ?

That is;

80² = 62²+b²

b² = 80²-62²

= 6400-3844

= 2556

b = √2556

= 50.6

Since <E= 90°

<D = 180-90+50

= 180-140

= 40°

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The loan amount for this extension is approximately $32,631. The correct option is (A) $32,631.

To find the loan amount for the extension Liam built onto his home, we can use the loan formula:

Loan formula:

PV = PMT * [{1 - (1 / (1 + r)^n)} / r]

Where,

PV = Present value (Loan amount)

PMT = Monthly payment

r = rate per month

n = total number of months

PMT = $750

r = 4.9% per annum / 12 months = 0.407% per month

n = 48 months

Putting the given values in the loan formula, we get:

PV = $750 * [{1 - (1 / (1 + 0.00407)^48)} / 0.00407]

PV ≈ $32,631 (rounded off to the nearest dollar)

Therefore, This extension's loan amount is roughly $32,631. The correct answer is option (A) $32,631.

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The trigonometric expression sin θ cot θ can be simplified to csc θ.

To simplify the expression sin θ cot θ, we can rewrite cot θ as 1/tan θ. Therefore, the expression becomes sin θ (1/tan θ).

Using the reciprocal identities, we know that csc θ is equal to 1/sin θ, and tan θ is equal to sin θ/cos θ. Therefore, we can rewrite the expression as sin θ (1/(sin θ/cos θ)).

Simplifying further, we can multiply sin θ by the reciprocal of (sin θ/cos θ), which is cos θ/sin θ. This simplifies the expression to (sin θ × cos θ)/(sin θ).

Finally, we can cancel out the sin θ terms, leaving us with just cos θ. Therefore, sin θ cot θ simplifies to csc θ.

In conclusion, the simplified form of the trigonometric expression sin θ cot θ is csc θ.

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The given function is y = 3cos(-θ/3). The period of the given function is 6π, its range is [-3,3] and the amplitude of 3.

The period of a cosine function is determined by the coefficient of θ. In this case, the coefficient is -1/3. The period, denoted as T, can be found by taking the absolute value of the coefficient and calculating the reciprocal: T = |2π/(-1/3)| = 6π. Therefore, the period of the function is 6π.

The range of a cosine function is the set of all possible y-values it can take. Since the coefficient of the cosine function is 3, the amplitude of the function is |3| = 3. The range of the function y = 3cos(-θ/3) is [-3, 3], meaning the function's values will oscillate between -3 and 3.

- The period of a cosine function is the length of one complete cycle or oscillation. In this case, the function has a period of 6π, indicating that it will complete one full oscillation over an interval of 6π units.

- The range of the function y = 3cos(-θ/3) is [-3, 3] because the amplitude is 3. The amplitude determines the vertical stretch or compression of the function. It represents the maximum displacement from the average value, which in this case is 0. Therefore, the graph of the function will oscillate between -3 and 3 on the y-axis.

In summary, the given function y = 3cos(-θ/3) has a period of 6π, a range of [-3, 3], and an amplitude of 3.

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The volume of the rubberized material that makes up the holder is 111.78 cubic centimeters.

To calculate the volume of the rubberized material, we need to subtract the volume of the can from the volume of the holder. The volume of the can can be calculated using the formula for the volume of a cylinder, which is given by V_can = π * r_can^2 * h_can, where r_can is the radius of the can and h_can is the height of the can. In this case, the can has a height of 12 centimeters and we can assume it has the same radius as the holder.

The volume of the holder can be calculated by subtracting the volume of the can from the volume of the entire holder. The volume of the entire holder is equal to the volume of a cylinder, which is given by V_holder = π * r_holder^2 * h_holder, where r_holder is the radius of the holder and h_holder is the height of the holder. In this case, the height of the holder is 11.5 centimeters, including 1 centimeter for the thickness of the base.

To find the radius of the holder, we subtract the thickness of the rim from the radius of the can. The thickness of the rim is 1 centimeter, so the radius of the holder is 11.5 - 1 = 10.5 centimeters.

Now we can calculate the volume of the can using the given values: V_can = π * (10.5)^2 * 12 = 1385.44 cubic centimeters.

Finally, we can calculate the volume of the rubberized material by subtracting the volume of the can from the volume of the holder: V_rubberized_material = V_holder - V_can = π * (10.5)^2 * 11.5 - 1385.44 = 111.78 cubic centimeters.

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Answer:

Gabriella made 4 two points shots and 8 three point shot

Step-by-step explanation:

Total point she scored=32

4 x 2 = 8 points

8 x 3 = 24 points

Total=32 points

1 step:

4 x 3 = 12

first we subtract 12 points that are due to more 4 three points shots.

Remaining points = 32 - 12 = 20

divide 20 into equally;

2 x 2 x 2 x2 = 8

3 x 3 x 3 x 3 = 12

The solution to the differential equation y'' + 4y = sec(2x) by variation of parameters is given by:

y(x) = -1/4 * [sec(2x) * sin(2x) + 2cos(2x)] + C1 * cos(2x) + C2 * sin(2x),

where C1 and C2 are arbitrary constants.

To solve the given differential equation using variation of parameters, we first find the complementary function, which is the solution to the homogeneous equation y'' + 4y = 0. The characteristic equation for the homogeneous equation is r^2 + 4 = 0, which gives us the roots r = ±2i.

The complementary function is therefore given by y_c(x) = C1 * cos(2x) + C2 * sin(2x), where C1 and C2 are arbitrary constants.

Next, we need to find the particular integral. Since the non-homogeneous term is sec(2x), we assume a particular solution of the form:

y_p(x) = u(x) * cos(2x) + v(x) * sin(2x),

where u(x) and v(x) are functions to be determined.

Differentiating y_p(x) twice, we find:

y_p''(x) = (u''(x) - 4u(x)) * cos(2x) + (v''(x) - 4v(x)) * sin(2x) + 4(u(x) * sin(2x) - v(x) * cos(2x)).

Plugging y_p(x) and its derivatives into the differential equation, we get:

(u''(x) - 4u(x)) * cos(2x) + (v''(x) - 4v(x)) * sin(2x) + 4(u(x) * sin(2x) - v(x) * cos(2x)) + 4(u(x) * cos(2x) + v(x) * sin(2x)) = sec(2x).

To solve for u''(x) and v''(x), we equate the coefficients of the terms with cos(2x) and sin(2x) separately:

For the term with cos(2x): u''(x) - 4u(x) + 4v(x) = 0,

For the term with sin(2x): v''(x) - 4v(x) - 4u(x) = sec(2x).

Solving these equations, we find u(x) = -1/4 * sec(2x) * sin(2x) - 1/2 * cos(2x) and v(x) = 1/4 * sec(2x) * cos(2x) - 1/2 * sin(2x).

Substituting u(x) and v(x) back into the particular solution form, we obtain:

y_p(x) = -1/4 * [sec(2x) * sin(2x) + 2cos(2x)].

Finally, the general solution to the differential equation is given by the sum of the complementary function and the particular integral:

y(x) = y_c(x) + y_p(x) = -1/4 * [sec(2x) * sin(2x) + 2cos(2x)] + C1 * cos(2x) + C2 * sin(2x).

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Answer:

Step-by-step explanation:

The probability that a randomly chosen test-taker will score between 135 and 159 is 0.8185.

The probability that a randomly chosen test-taker will score between 135 and 159 can be found by standardizing the values of X to the corresponding Z-scores and then finding the probabilities from the normal distribution table. Let X be the LSAT test score of a randomly chosen test-taker.

We have;

Z₁ = (X₁ - μ) / σ = (135 - 151) / 8 = -2

Z₂ = (X₂ - μ) / σ = (159 - 151) / 8 = 1

The probability that a randomly chosen test-taker will score between 135 and 159 is the area under the standard normal curve between the corresponding Z-scores.

Z₁ = -2 and Z₂ = 1.

Using the standard normal distribution table, the probability is;

P(-2 ≤ Z ≤ 1) = P(Z ≤ 1) - P(Z ≤ -2)

P(Z ≤ 1) = 0.8413

P(Z ≤ -2) = 0.0228

P(-2 ≤ Z ≤ 1) = 0.8413 - 0.0228 = 0.8185

Therefore, the probability that a randomly chosen test-taker will score between 135 and 159 is 0.8185 (rounded to four decimal places).

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The number of ways to select three members for the search and rescue mission, ensuring at least one officer is included, is 140 + 10 = 150.

Scenario 1: Selecting one officer and two non-officers: In this scenario, we choose one officer from the five available officers and two non-officers from the remaining eight members. The number of ways to choose one officer from five officers is represented by C(5, 1), which is equal to 5. Similarly, the number of ways to choose two non-officers from the remaining eight members is represented by C(8, 2), which is equal to 28. Therefore, the total number of ways to choose one officer and two non-officers is obtained by multiplying these two combinations: 5 * 28 = 140. Scenario 2: Selecting three officers: In this scenario, we select three officers from the five available officers. The number of ways to choose three officers from a group of five officers is represented by C(5, 3), which is equal to 10. To find the total number of ways to select three members for the search and rescue mission, ensuring at least one officer is included, we add the results from both scenarios: 140 + 10 = 150. Therefore, there are 150 different ways to select three members for the search and rescue mission, ensuring that at least one officer is included, from the Civil Air Patrol unit of thirteen members.

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Answer:

(-3,0),(-2,1),(-1,0),(0,-3),(-5,-8)

Step-by-step explanation:

By using a half-angle identity we find that the exact value of tan 15° is 2 - √3.

This can be found using the half-angle identity for the tangent, which states that tan(θ/2) = (1 - cos θ)/(sin θ). In this case, θ = 15°, so tan(15°/2) = (1 - cos 15°)/(sin 15°).

The half-angle identity for the tangent can be derived from the angle addition formula for the tangent. The angle addition formula states that tan(α + β) = (tan α + tan β)/(1 - tan α tan β). If we set α = β = θ/2, then we get the half-angle identity for a tangent: tan(θ/2) = (1 - cos θ)/(sin θ)

To find the exact value of tan 15°, we need to evaluate the expression (1 - cos 15°)/(sin 15°). The cosine of 15° can be found using the double-angle formula for cosine, which states that cos 2θ = 2 cos² θ - 1. In this case, θ = 15°, so cos 15° = 2 cos² 7.5° - 1.

The sine of 15° can be found using the Pythagorean identity, which states that sin² θ + cos² θ = 1. In this case, θ = 15°, so sin 15° = √(1 - cos² 15°).

Substituting these values into the expression for tan 15°, we get:

tan 15° = (1 - cos 15°)/(sin 15°) = (1 - 2 cos² 7.5° + 1)/(√(1 - cos² 15°)) = (2 - 2 cos² 7.5°)/(√(1 - cos² 15°))

The value of cos 7.5° can be found using the calculator. Once we have this value, we can evaluate the expression for tan 15°. The exact value of the given expression tan 15° is 2 - √3.

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The set S is a vector space.

To determine if S is a vector space, we need to check if it satisfies the ten properties of a vector space.

1. The zero vector exists: In this case, the zero vector would be the function y(x) = 0, which satisfies the differential equation y'' + 2y' - y = 0, since the derivative of the zero function is also zero.

2. Closure under addition: If f(x) and g(x) are both functions satisfying the differential equation y'' + 2y' - y = sin(x), then their sum h(x) = f(x) + g(x) also satisfies the same differential equation. This can be verified by taking the second derivative of h(x), multiplying by 2, and subtracting h(x) to check if it equals sin(x).

3. Closure under scalar multiplication: If f(x) is a function satisfying the differential equation y'' + 2y' - y = sin(x), and c is a scalar, then the function g(x) = c * f(x) also satisfies the same differential equation. This can be verified by taking the second derivative of g(x), multiplying by 2, and subtracting g(x) to check if it equals sin(x).

4. Associativity of addition: (f(x) + g(x)) + h(x) = f(x) + (g(x) + h(x))

5. Commutativity of addition: f(x) + g(x) = g(x) + f(x)

6. Additive identity: There exists a function 0(x) such that f(x) + 0(x) = f(x) for all functions f(x) satisfying the differential equation.

7. Additive inverse: For every function f(x) satisfying the differential equation, there exists a function -f(x) such that f(x) + (-f(x)) = 0(x).

8. Distributivity of scalar multiplication over vector addition: c * (f(x) + g(x)) = c * f(x) + c * g(x)

9. Distributivity of scalar multiplication over scalar addition: (c + d) * f(x) = c * f(x) + d * f(x)

10. Scalar multiplication identity: 1 * f(x) = f(x)

By verifying that all these properties hold, we can conclude that the set S is indeed a vector space.

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Answer:

74.088 mm^3

Step-by-step explanation:

V = l * w * h

V = 4.2 * 4.2 * 4.2

V = 74.088 mm^3

The maximum height reached by the projectile is 12 feet, and it hits the ground approximately 1.228 seconds and 3.772 seconds after being launched.

To find the maximum height reached by the projectile and the time it takes to hit the ground, we can analyze the given quadratic function H(t) = -16t^2 + 72t + 12.

The function H(t) represents the height of the projectile at time t seconds after its launch. The coefficient of t^2, which is -16, indicates that the path of the projectile is a downward-facing parabola due to the negative sign.

To determine the maximum height, we look for the vertex of the parabola. The x-coordinate of the vertex can be found using the formula x = -b / (2a), where a and b are the coefficients of t^2 and t, respectively. In this case, a = -16 and b = 72. Substituting these values, we get x = -72 / (2 * -16) = 9/2.

To find the corresponding y-coordinate (the maximum height), we substitute the x-coordinate into the function: H(9/2) = -16(9/2)^2 + 72(9/2) + 12. Simplifying this expression gives H(9/2) = -324 + 324 + 12 = 12 feet.

Hence, the maximum height reached by the projectile is 12 feet.

Next, to determine the time it takes for the projectile to hit the ground, we set H(t) equal to zero and solve for t. The equation -16t^2 + 72t + 12 = 0 can be simplified by dividing all terms by -4, resulting in 4t^2 - 18t - 3 = 0.

This quadratic equation can be solved using the quadratic formula: t = (-b ± √(b^2 - 4ac)) / (2a), where a = 4, b = -18, and c = -3. Substituting these values, we get t = (18 ± √(18^2 - 4 * 4 * -3)) / (2 * 4).

Simplifying further, we have t = (18 ± √(324 + 48)) / 8 = (18 ± √372) / 8.

Using a calculator, we find that the solutions are t ≈ 1.228 seconds and t ≈ 3.772 seconds.

Therefore, the projectile hits the ground approximately 1.228 seconds and 3.772 seconds after its launch.

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Option (B) --------->  m<EFN  =   80 degrees

Step-by-step explanation:

m<EFG = m<EFN + m<NFG

m<EFG  = 153 degrees

m<NFG =  73 degrees

153 = m<EFN + 73

m<EFN  =  153 - 73

             =   80 degrees

Therefore, we have found that the required angle m<EFN is:

m<EFN  =  80 degrees

I hope this helps you!

The standard deviation of the weights for the 10 adults is approximately 3.36 kg.

To determine the standard deviation of the weights for the 10 adults, you can follow these steps:

Calculate the mean of the weights:

Mean = (72 + 78 + 76 + 86 + 77 + 77 + 80 + 77 + 82 + 80) / 10 = 787 / 10 = 78.7 kg

Calculate the deviation of each weight from the mean:

Deviation = Weight - Mean

For example, the deviation for the first weight (72 kg) is 72 - 78.7 = -6.7 kg.

Square each deviation:

Square of Deviation = Deviation^2

For example, the square of the deviation for the first weight is (-6.7)^2 = 44.89 kg^2.

Calculate the variance:

Variance = (Sum of the squares of deviations) / (Number of data points)

Variance = (44.89 + 2.89 + 1.69 + 49.69 + 0.09 + 0.09 + 1.69 + 0.09 + 9.69 + 1.69) / 10

= 113.1 / 10

= 11.31 kg^2

Take the square root of the variance to get the standard deviation:

Standard Deviation = √(Variance) = √(11.31) ≈ 3.36 kg

Therefore, the correct answer is not provided among the options. The closest option is D.

3.96

3.96, but the correct value is approximately 3.36 kg.

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The shortest time it takes to serve 200 customers is 1,000 minutes.

To find the shortest time it takes to serve 200 customers with two tellers at a commercial bank, we need to consider the average serving times of each teller.

Let's denote the first teller as T1, who takes 3 minutes to serve a customer, and the second teller as T2, who takes 5 minutes to serve a customer.

Since the two tellers start serving the customers at the same time, we can think of this scenario as a cycle where T1 and T2 alternate serving customers.

The cycle completes when both tellers have served the same number of customers.

Since the least common multiple (LCM) of 3 and 5 is 15, we can determine that the cycle will complete after every 15 customers served (T1 serves 15 customers, T2 serves 15 customers).

To serve 200 customers, we divide the total number of customers by the number of customers served in one complete cycle:

Number of cycles = 200 / 30 = 6 cycles and 10 remaining customers.

For each complete cycle, it takes a total of 15 minutes (3 minutes for each customer).

Therefore, for 6 cycles, it would take 6 cycles [tex]\times[/tex] 15 minutes = 90 minutes.

For the remaining 10 customers, we need to consider whether T1 or T2 will serve them.

Since we start with both tellers serving customers, T1 will serve the first 5 remaining customers, and T2 will serve the last 5 remaining customers. Each of these sets of customers will take a total of 5 [tex]\times[/tex] 3 minutes = 15 minutes.

Adding up the time for the complete cycles and the remaining customers, the shortest time it takes to serve 200 customers is 90 minutes + 15 minutes = 105 minutes.

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The solution of the given matrix equation is [tex]`X = [2/9, 2/3]`.[/tex].

The given matrix equation is as follows:

`[1 1 1 2][x y]= [8 10]`

It can be represented in the following form:

`AX = B`

where `A = [1 1 1 2]`,

`X = [x y]` and `B = [8 10]`

We need to solve for `X`. We will write this in the form of `Ax=b` and represent in the Augmented Matrix as follows:

[1 1 1 2 | 8 10]

Now, let's perform row operations as follows to bring the matrix in Reduced Row Echelon Form:

R2 = R2 - R1[1 1 1 2 | 8 10]`R2 = R2 - R1`[1 1 1 2 | 8 10]`[0 9 7 -6 | 2]`

`R2 = R2/9`[1 1 1 2 | 8 10]`[0 1 7/9 -2/3 | 2/9]`

`R1 = R1 - R2`[1 0 2/9 8/3 | 76/9]`[0 1 7/9 -2/3 | 2/9]`

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