Find a point e on cd such that the ratio of ce to cd is 3/8

Can someone me with my hwplz(only the circled ones)

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.

What statement is true? 2x^2-9x+2=-1