Solve x^2 = 196 and c^3 = 216. A) x = 14; c = −6
B) x = ±14; c = 6
C) x = ±14; c = ±6
D) x = ±14; no solution for c

i believe the answer is d.

hope it you! : d

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).