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Alika [10]
3 years ago
10

Simplify the expression 21b4 − 3b by combining like terms. choose the correct answer please just tell me the answer i'm running

out of time.
18b^3
21b^4 − 3b
18b^5
18b^4
Mathematics
1 answer:
marissa [1.9K]3 years ago
8 0
The answer is D, I believe, 18b^4.
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Answer:

Step-by-step explanation:

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Multiply equation (II) by (-1)

(I)             x + 3y = 15

(II)*(-1)    <u> - x -  y   = -9</u>   {Now add}

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Plugin y = 3 in equation (I)

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