Which relation is a function?
{(5,0), (0,5), (-5, -5)}
{(5, 0,) (-8,-5)}
{(5,0), (-8,-5), (-8, 5), (-5, -8)}
{(5,0), (0, -8), (5, -5)}

answer:     true

step-by-step explanation:

answer is b

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).