A parabola has a directrix of y=-3 and a focus of (0,5). Show that the point (12, 10) must lie on this parabola. I was thinking, to solve this would I need to use the distance formula? If I’m wrong please explain.

Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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.