Call Me cell phone company charges $200 for 20 gigabytes (GB) of data. There is an overage charge fee of $15 for every GB you use over 20. If you use 23 GB of data this
month, which of the following will be your total cell phone cost for the month?

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Step-by-step explanation:

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the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).