A coach has analyzed times in swimming races and hours of training for the races and found a correlation of 10.78. The race times have an average of 3.4 minutes with a standard deviation of 0.2 minutes. The training times have an average of 16.4 hours and a standard deviation of 1.8 hours.

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).

the answer on ed. is:

c. "the graph of f(x) has exactly two x-intercepts."

hope i could someone! : )