13. the submarine dives into the sea at a rate of 50
feet per hour. how long would it take the
submarine to reach -300 feet?

it would take six hours to reach

Step-by-step explanation:

it would take 6 hour because i did 50+50+50+50+50+50 and it equallys 300

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).

answer: the answer is d