please help me with this review. its for extra credit and i really need the extra credit. please leave explination with the correct work!!! even if i you only do 1 question you would still be helping me!

The heaviest 16% of all men in weight weigh more than how many pounds ?

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 many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.