GIve me the answer pls

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18