PLEASE HELP WHAT IS THE UNIT RATES OF THIS

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

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

If sin(x) = 0 and cos(x) = 1, what is tan(x)?