Find hcf of 4x^2-100 and 4x+20​

Question 5 spring semester final exam math evaluate

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 is not true about kl and mn? what is mn? (show your work)