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3 years ago

Please help asap!!!

Mathematics

2 answers:

erik [133]3 years ago

6 0

D-A-C-B should be the order
i really hope this helps

ruslelena [56]3 years ago

3 0

D.
A.
C.
B.

Is the answer. I just took the test!

I hope this helps. :)

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A chemist has 20% and 50% solutions of acid available. How many liters of each solution should be mixed to obtain 75 liters of 2

mash [69]

Answer:

we will mix 55 liters of 20% solution and 20 Liters of 50% solutions.

Step-by-step explanation:

let the 20% solution = x liters

let the 50% solution = y liters

total solution of the mixture of the two solutions in % = 28%

total solution of the mixture of the two solutions in liters = 75 liters

considering the total solutions given, we will have the following equations if we mix the solutions in equal proportion;

20x + 50y = 28 (75)

0.2x + 0.5y = 0.28(75)

0.2x + 0.5y = 21 -------equation 1

Also,

x + y = 75 ------equation 2

y = 75 - x

(substitute this into equation 1)

0.2x + 0.5(75 - x) = 21

0.2x + 37.5 - 0.5x = 21

0.2x - 0.5x = 21 - 37.5

-0.3x = -16.5

x = -16.5 / -0.3

x = 55 liters

Recall, y = 75 - x

y = 75 -55

y = 20 Liters

Thus, we will mix 55 liters of 20% solution and 20 Liters of 50% solutions.

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3 years ago

If the Earth has revolved exactly once around the Sun since the last time that Samson went to the zoo, how much time has passed?

LenaWriter [7]

The correct answer among all the other choices is B. one year. If the Earth had revolved exactly once around the Sun since the last time that Samson went to the zoo, a year has passed. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.

8 0

4 years ago

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Eduardo is painting a rectangular wall that is 96 inches high and 110 inches long. What is the area of the wall?

EastWind [94]

<h3>Required Answer:-</h3>

Here the height and length are the sides of the rectangular wall and we have to find the area.

Area of rectangle is given by:

$= l \times b$

where l is the length and b is the breadth/width according to the question. Plugging the given values:

$= 110 \times 96 \: {inch}^{2}$

$= 10560 \: {inch}^{2}$

<h3>Hence:-</h3>

The area of the wall is 10560 inch²

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3 years ago

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liberstina [14]

Answer:

16 miles

Step-by-step explanation:

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Marley was asked to solve x2 - 4x + 9 = 0 using the Quadratic Formula. She found the discriminant first and decided she did not

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We have been given Marley was asked to solve $x^2-4x+9 = 0$ using the Quadratic Formula. She found the discriminant first and decided she did not need to continue with the Quadratic Formula.