Someone help me pls
Answer:
1 rubber cube dude give since we'll
A chemist has two solutions of HNO3. One has a 40% concentration and the other has a 25% concentration.
How many liters of each solution must be mixed to obtain 57 liters of a 26% solution?
Step-by-step explanation:
Let +a+ = liters of 40% solution needed
Let +b+ = liters of 25% solution needed
+.4a+ = liters of HN03 in 40% solution
+.25b+ = liters of HN03 in 25% solution
------------------------------------
(1) +%28+.4a+%2B+.25b+%29+%2F+57+=+.26+
(2) +a+%2B+b+=+57+
-----------------
(1) +.4a+%2B+.25b+=+.26%2A57+
(1) +.4a+%2B+.25b+=+14.82+
(1) +40a+%2B+25b+=+1482+
Multiply both sides of (2) by +25+
and subtract (2) from (1)
(1) +40a+%2B+25b+=+1482+
(2) +-25a+-+25b+=+-1425+
+15a+=+57+
+a+=+3.8+
and, since
(2) +a+%2B+b+=+57+
(2) +3.8+%2B+b+=+57+
(2) +b+=+53.2+
3.8 liters of 40% solution are needed
53.2 liters of 25% solution are needed
check:
(1) +%28+.4a+%2B+.25b+%29+%2F+57+=+.26+
(1) +%28+.4%2A3.8+%2B+.25%2A53.2+%29+%2F+57+=+.26+
(1) +%28+1.52+%2B+13.3+%29+%2F+57+=+.26+
(1) +14.82+=+.26%2A57+
(1) +14.82+=+14.82+
think you should got the answer
If <1 and <2 are complementary angles, and m<1 = 74", find m<2
what’s the answer?
Answer:
m<2=16
Step-by-step explanation:
Kevin and Randy Muise have a jar containing 68 coins, all of which are either quarters or nickels. The total value of the coins in the jar is $8.00. How many of each
type of coin do they have?
The jar contains
quarters
9514 1404 393
Answer:
23 quarters45 nickelsStep-by-step explanation:
Let q represent the number of quarters. Then the number of nickels is 68-q, and the number of cents in the jar is ...
25q +5(68 -q) = 800
20q +340 = 800 . . . . simplify
20q = 460 . . . . . . . . subtract 340
q = 23 . . . . . . . . . . . divide by 20; this is the number of quarters
68-q = 45 . . . . . . . find the number of nickels
The jar contains 23 quarters and 45 nickels.
Why is y=3 a polynomial function?
Answer: y=3 is a polynomial function? Yes. The equation y=3 represents the function that maps all x values to 3
Step-by-step explanation:
The equation y= 3 represents a horizontal line, which will have exactly one intersection point with any vertical line. So it passes the vertical line test for a function too.
graph{y=3+0.0000001x [-10, 10, -5, 5]}
To miss a particular shade of pink paint white paint and red paint are mixed in the ratio 4:3 if 12 gallons of red paint are mixed with some white paint to make this same shade of pink how many total gallons of pink result
Find the area of the figure. (Sides meet at right angles.)
4 ft
5ft
4 ft
9ft
8 ft
Answer:
52 square feet.
Step-by-step explanation:
length*width=area
Top rectangle = 4ft*5ft = 20sq.ft
Bottom rectangle = 4ft*8ft = 32sq. ft
20+32=52 sq.ft OR (4*5)+(4*8)=52sq.ft
Use your graphing calculator to solve the equation graphically for all real solutions
23 – 6x2 + 4x + 16 = 0
Solutions: 2 =
2x+20=12x by first subtracting 20 from each side what property allows you to do so does it help you get closer to finding a solution what is a better first step
Answer:
Step-by-step explanation:
2x+20=12x
We can subtract 2x from both sides:
2x+20-2x=12x-2x
20=10x
20/10=x
x=2
The graph of a linear function f passes through the point (3, -10) and has a slope of -5. What is the zero ?
A. 1
B. -1
C. 5
D. -5
Really need help.
Answer:A
Step-by-step explanation:
if there is not enough evidence to support the alternative hypothesis, we can accept the null hypothesis. true or false?
Answer:
true
Step-by-step explanation:
Answer:
True
Step-by-step explanation:
That is the definition of null hypothesis, when there is not enough information to support a hypothesis, we can accept a null hypothesis.
The midpoint of an is m (-6,1). If the coordinates of a are (-5,7), what are the coordinates of b
Answer:
B= (-7, -5)
Step-by-step explanation:
The midpoint point formula is (X1 plus X2) divided by 2 to get the x value of the midpoint and do the same for the Y value, ( Y1 plus Y2) divided by 2. So, because you already have the midpoint you have to work backwards. So for the x value of B the formula would be (-5 + X) divided by 2 equals -6 and then you just solve for X. Same thing for the Y value (7 + Y) divided by 2 equals 1. Then you should get both values for B (-7, -5)
Write the expression in simplest form.
HERE IS THE ANSWER (see the picture)
−3/5−(−2/5)=
What is the sum to this problem hurry fast awnser plz
[tex] \frac{ - 3}{5} - ( \frac{ - 2}{5} ) \\ = \frac{ -3 }{5} + \frac{2}{5} \\ = \frac{ - 3 + 2}{5} \\ = \frac{ - 1}{5} [/tex]
Answer:
[tex] - \frac{3}{5} - ( - \frac{2}{5} )[/tex]
[tex] - \frac{3}{5} + \frac{2}{5} [/tex]
[tex] \frac{ - 3 + 2}{5} [/tex]
[tex] - \frac{ 1}{5} [/tex]
Can someone help me do this i need helpppp
Please solve the math problem... I will mark you brainliest
Answer:
the answer is 140
........
The cost of $ 385 in 2004 was 10% more than the cost in2003. Calculate the cost in 2003.
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Answer:
$350
Step-by-step explanation:
Let c represent the cost in 2003. Then we have the cost in 2004 is ...
c + 0.10·c = 385
1.1c = 385
c = 385/1.1 = 350
The cost in 2003 was $350.
WILL MARK BRAINLIEST !!!!
Neveah has created the function f(x) = the quantity of 2x plus 4, divided by 3 to represent the growth of her hair, where x represents the number of months since her last hair cut. Neveah discovers that, using the inverse function to solve for x = 6, she can predict when her hair will have grown 6 inches. Explain to Neveah how to accomplish this, using complete sentences.
Therefore, growth of her hair is 6 inches in 7 months.
Step-by-step explanation:
Helppp meeee pleaseeee !
Answer:
51.2 degrees Celsius
Step-by-step explanation:
classify -0.25 as rational or irrational. explain.
Answer:
Rational
Step-by-step explanation:
Rational numbers include fractions and decimals that end or have a pattern. Irrational numbers, however, do not end and have an arbitrary pattern. -0.25 is rational because it is a terminating decimal which means it ends.
Examples of irrational numbers include:
√2 , -√101 , π (pi)
Examples of rational numbers include:
-0.89 , √16 , 1/3
i hope this helps :)
Select all the points of intersection between the graphs
of the functions f(x) = (x + 5)(x - 2) and
g(x) = (2x + 1)(x - 2).
Answer:
f(x)=(x+5)(x-2)
g(x)=(2x+1)(x-2).
x=10x+2
x=3x-2
x=12×+1
x=13
A function is defined as a relation between a set of inputs having one output each.
The point of intersection between the function f(x) and g(x) is x = 4.
What is a function?A function is defined as a relation between a set of inputs having one output each.
We have,
f(x) = ( x + 5 ) ( x - 2 )
g(x) = ( 2x + 1 ) ( x - 2 )
To find the points of intersection between the two functions we must equal the function.
f(x) = g(x)
( x + 5 ) ( x - 2 ) = ( 2x + 1 ) ( x - 2 )
( x - 2 ) gets canceled
x + 5 = 2x + 1
5 - 1 = 2x - x
4 = x
x = 4
This means that at x =4 the function f(x) and g(x) intersect.
we can see that at x = 4 both the functions have the same value.
f(x) = ( x + 5 ) ( x - 2 ) = ( 4 + 5 ) ( 4 - 2 ) = 9 x 2 = 18
g(x) = ( 2x + 1 ) ( x - 2 ) = ( 2 x 4 + 1 ) ( 4 - 2 ) = ( 8 + 1 ) ( 4 - 2 )
= 9 x 2
= 18
Thus the point of intersection between the function f(x) and g(x) is x = 4.
Learn more about functions here:
https://brainly.com/question/343077
#SPJ5
vx-w=2
rearrange it and make x the subject
Answer:
[tex]vx - w = 2 \\ vx = 2 + w \\ x = \frac{2 + w}{v} [/tex]
Plz help it’s due tonight!!!
How does a sequence of translations , relections , and rotations result in congreunt figures
Answer:
if the size (and shape) of the figure doesn't change then it's congruent
Step-by-step explanation:
6 3/4 ÷1 1/8
HELP ME PLEASE
Answer: 6
Step-by-step explanation:
if f(x)=2x^2+12 , what is f(3)
Answer:
f(3) = 30
Step-by-step explanation:
f(3) = 2(3)^2 + 12 = 30
A hand held digital music player was marked down 1/4 of the original price.
If the sales price is $128.00, what was the original price?
Answer:
A) you would divide $128 by 4, getting $32. then add that to the original price, being $160.
B) you would divide $160 by 2, getting $80, then add those two together in order to find what it was marked up to, is $240. hopeful, this helps
Step-by-step explanation:
( BRAINLIEST QUEATION)
Before Ahmed started to diet. his mass was 108kg. His mass now is 88kg. What percentage of his original mass has he lost?
Answer:
Step-by-step explanation:
Weight decreased = 108 - 88 = 20 Kg
Percentage decrease = [tex]\frac{20}{108}*100[/tex]
= 18.52%
Determine the number of lines of symmetry for each figure.
Answer:
1) 6
2)0
3)1
The lines of symmetry are like the line that are the perfect half
A fair dice is rolled. Find the probability of showing an even prime number
please help me it's math I really need the answer!
Answer:
1/36
Step-by-step explanation:
outcomes/total number of outcomes
1/36
I think this is it but I'm not sure, don't take my word for it if you don't think it's correct either.