I need help for a quiz please

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 values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees