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3 years ago

HURRY PLS! Evaluate if a= 4 and b=7 28÷ b+7 A. 14 B. 11

Mathematics

1 answer:

Nastasia [14]3 years ago

8 0

Step-by-step explanation:

Hi, I think correct variant is B

(28÷7)+7=4+7=11

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Use the expression below to answer the question. 20 + 8y – 9y – 21 Which expression is equivalent? A. 2(10 + 4y – 7y – 19) B. 2(

Amanda [17]

Option D: $4(5+2y)-3(3y+7)$ is the correct answer.

Explanation:

The expression is $20+8 y-9 y-21$

Solving the expression, we have,

$-y-1$

Now, we need to find an expression equivalent to $20+8 y-9 y-21$

Option A: $2(10+4y-7y-19)$

Solving the expression, we have,

$\begin{aligned} 2(10+4 y-7 y-19) &=2(-9-3 y) \\ &=-18 y-6 y \end{aligned}$

From the result, the expression $2(10+4y-7y-19)$ is not equivalent to $20+8 y-9 y-21$

Option A is not the correct answer.

Option B: $2(10+4 y)-3(3 y-7)$

Solving the expression, we have,

$\begin{aligned} 2(10+4 y)-3(3 y-7) &=20+8 y-9 y+21 \\ &=-y+41 \end{aligned}$

From the result, the expression $2(10+4 y)-3(3 y-7)$ is not equivalent to $20+8 y-9 y-21$

Option B is not the correct answer.

Option C: $4(5+2y-5y-17)$

Solving the expression, we have,

$\begin{aligned} 4(5+2 y-5 y-17) &=20+8 y-20 y-68 \\ &=-12 y-48 \end{aligned}$

From the result, the expression $4(5+2y-5y-17)$ is not equivalent to $20+8 y-9 y-21$

Option C is not the correct answer.

Option D: $4(5+2 y)-3(3 y+7)$

Solving the expression, we have,

$\begin{aligned} 4(5+2 y)-3(3 y+7) &=20+8 y-9 y-21 \\ &=-y-1 \end{aligned}$

From the result, the expression $4(5+2 y)-3(3 y+7)$ is equivalent to $20+8 y-9 y-21$

Option D is not the correct answer.

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C.43 in because you got to think about it then you haft to add

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With process of elmination the answer is C because all the rest are the same number but placed it is different order.
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Note: see attached image.
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