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3 years ago

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For the past three months , grace used her cell phone for 43 minutes , 62 minutes, and 57 minutes. How many minutes would she ha

ve to use her cell phone this month for the average usage over the four months to be 55 minutes?

1 answer:

tangare [24]3 years ago

3 0

She needs to use it 58 more minutes

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umka2103 [35]

Answer:

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Step-by-step explanation:

The first step is to find the GCF. Here, it's 3.

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Then, you factor the polynomial in the parenthesis.

To find the factors, you will need to find 2 numbers that add to -7, and multiply to 10. -2 and -5 add to -7 and multiply to 10. Now, replace -7a with the factors.

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This of this polynomial as 2 problems.

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Then, factor again.

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$a(a-2)$ $-5(a-5)$

Then, you keep the factors in parenthesis, and combine the numbers on the outside.

$(a-2)(a-5)(a-5)$

Since, there are 2 of the same factor, you only need one.

$(a-2)(a-5)$

BUT REMEMBER!! In the very beginning, we had a 3 that we took out, we STILL need to add that to the final answer. The <u>final answer</u> is:

$3 (a-2) (a-5)$

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