Which set of numbers can represent the side lengths, in inches, of an acute triangle?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

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.

Which number produces a rationale number when multiplied by 1/5