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3 years ago

Please help ASAP !!!!!

Mathematics

1 answer:

Ket [755]3 years ago

3 0

Answer:

I got you

Step-by-step explanation:

you just gotta get good kid :D

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The chemistry class was making 300 gallons of 30% isopropyl alcohol. They mixed 12% with 42%. How much of each did they use?

alexgriva [62]

Answer:

The chemistry class mixed 120 gallons of 12% isopropyl alcohol and 180 gallons of 42% isopropyl alcohol.

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Amount of isopropyl alcohol made by the chemistry class = 300 of 30%

Amount of 12% isopropyl alcohol mixed by the chemistry class = x

Amount of 42% isopropyl alcohol mixed by the chemistry class = 300 - x

2. How much of each did they use?

Let's write our equation to solve for x, this way:

30% = 0.3, 12% = 0.12, 42% = 0.42

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12x + 126 - 0.42x = 90

-0.3x = 90 - 126

-0.3x = -36

x = -36/-0.3

x = 120 ⇒ 300 - x = 180

Let's prove x = 120 is correct

0.12x + 0.42 (300 - x) = 0.3 * 300

0.12 * 120 + 0.42 (300 - 120) = 0.3 * 300

14.4 + 75.6 = 90

90 = 90

We proved x = 120 is correct

5 0

3 years ago

Solve the value X ASAP!!

anzhelika [568]

The answer is B I think

8 0

3 years ago

Need help will give brainlist

allsm [11]

Answer:

3rd option

Step-by-step explanation:

- 1 ( $\frac{3x}{2y}$ )

- 1 is multiplying the complere fraction , not just 1 part of it , so

= - $\frac{3x}{2y}$

5 0

2 years ago

Evaluate the exponential expression: (2x)2−3y2=___, if x = 5 and y = 3.

777dan777 [17]

Answer:

Step-by-step explanation:

Put the values of the variables where the variables are, then do the arithmetic.

(2·5)^2 -3·3^2 = 10^2 -3·9 = 100 -27 = 73

___

Or, you can let a calculator or spreadsheet evaluate the function for you.

7 0

3 years ago

Evaluate [(21 + 6) − 32] ק 9 ⋅ 2.

anzhelika [568]

OK.......
Evaluating [(21 + 6) - 32] 2 * 9 $ק$
Your answer would be
-90

H0P3 It H3LPS :)

8 0

4 years ago