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Andrew earns an allowance of $12 the first week, $17 the next week, $22 the following week, and so on. How much will Andrew earn over the course of 10 weeks?

kalanee  Feb 9, 2018

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Sum them up as an arithmetic series:

N =[L - F] / D + 1

10 =[L - 12] / 5 + 1

L = 57 - last allowance

[F + L] / 2 x N =Sum

Sum =[12 + 57] / 2 x 10

Sum =[69] / 2 x 10

Sum = 34.5 x 10

Sum = $345.00 - Andrew's total allowance over 10-week period.

Guest Feb 9, 2018
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 #1
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Best Answer

Sum them up as an arithmetic series:

N =[L - F] / D + 1

10 =[L - 12] / 5 + 1

L = 57 - last allowance

[F + L] / 2 x N =Sum

Sum =[12 + 57] / 2 x 10

Sum =[69] / 2 x 10

Sum = 34.5 x 10

Sum = $345.00 - Andrew's total allowance over 10-week period.

Guest Feb 9, 2018

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