Can you plz help me right answer only help me plz

What is the perimeter of square abcd? units units 28 units 37 units

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

How is working backward similar to solving an equation?