5. Which expression is equivalent to 2.5(4.2x + 7.4y) -3.6(8X - 4.5y)- (2.4x + 6y)
-20.7x + 2.3y
0
-20.7x + 28.7y
©
-20.7x + 22.7y
0
8xy

step-by-step explanation:

there are infinitely many solutions.

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).