Suppose four friends each pay for a pair of socks and one 30- minute jump. The jump costs $10.50 per person. If they spend a
total of $50, then the equation 4 (10.50 + x) = 50 can be used
to find the cost x of the socks.
Write About It!
What is the cost to rent a pair of socks?
Write a mathematical argument that can be used to defend
your solution.

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step-by-step explanation:

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).