How many six character password can be made using only a, b,c, d,e, f,1,2,3,4?

Find x to the nearest hundredth place

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 expression is equivalent to 42x-56y