How many diagonals does a hexagon have?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Can someone answer this question? : )

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer