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NeTakaya
3 years ago
11

3(4x + 5) = 12 Which of the following correctly shows the beginning steps to solve this equation?

Mathematics
1 answer:
Contact [7]3 years ago
8 0
The correct answer is A.

Here is the completed problem:

3(4x+5)=12

Distributive property.

3(4x+5)=12

Simplify

12x+15=12

Subtract 15 from both sides.

12x+15−15=12−15

12x=−3

Divide both sides by 12.

12x/12 = −3/12

x= −1/4
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Can you explain step by step for #15 and #16 I have a test on this tomorrow
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Answer:

15.

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

16. 10 ml of 20% saline and 40 ml of 10% saline

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15. We get the system of two equations:

\left\{\begin{array}{l}x+y=50\\0.2x+0.1y=6\end{array}\right.

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x=50-y

Substitute it into the second equation:

0.2(50-y)+0.1y=6\\ \\10-0.2y+0.1y=6\\ \\-0.1y=6-10\\ \\-0.1y=-4\\ \\y=40\\ \\x=50-y=50-40=10

7 0
3 years ago
Please help me and show your work
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Step-by-step explanation:

y = 3x + 4

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y = 3*3 + 4

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y = 13

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2) y =x - 7

Plugin x = 10 in the equation

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y = 3

Plugin x = 15 in the equation

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Plugin x = 20 in the equation

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6 0
2 years ago
Please help im so confused??
Vlad1618 [11]
V = PI x r^2 x h/3

11^2 = 121
121 * 84 = 10164

 answer is 10164PI units^3

answer is B

3 0
3 years ago
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