Can someone please help me solve these two quadratic equations by factoring!

What is the approximate circumference of the circle shown below?

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 the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex