Please Help! Which of the following is NOT a rational expression?
(x+9)(4x-3)/x+7
3x^(2)-4x^(-3)+1/8x
6x/4
2x^(2)+6x/9x+1

What is the size of the matrix resulting from

What is the quadric regression equation that fits these data

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.