If a over 2 equals b over 3 then b over a equals what?

If anyone has done the algebra 2 chaos theory portfolio would you be wiling to me? i kind of know what i'm doing i just don't know if i'm doing it right.

East black horse $0.25 total budget is $555 it'll cost $115 for other supplies about how many flyers do you think we can buy

Kayaks rent for $35 per day. which expression can you use to find the cost in dollars of renting 3 kayaks for a day?