solving these problem

What are the soultion(s) to the quadratic equation 40- x^2=0

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

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with