Does anybody know how to do this...

Write the sentence as an equation. 6 fewer than the quantity 140 times j equals 104

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.