If Maersk ran a total 80 trains a day with each having 180 containers per train, how many cars would they need in total?

Assuming 1 container per train car..

180 * 80

can be done mentally as

18 * 8 = 144

add the two zeroes onto the answer

180 * 80 = 14,400

14,400 train cars would be needed

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).