07-02-2018
Mathematics

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How do we do this question?

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choixongdong choixongdong

07-02-2018

let x = # of monthly fee
f(x) = (50x + 30)/x

average cost will be below 56 for how many months?
(50x + 30)/x = 56
50x + 30 = 56x
56x - 50x = 30
6x = 30
x = 5

answer:
the average cost will be below $56 for 5 months

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