I need help with these questions

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.

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

What is the result of adding the system of equations? 2x+y=4 3x-y=6