Can someone helpp me

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Find the roots of the equation below. x^2 - 6 + 9 = 0

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.