Can ya'll help me out with questions 9-13 pls I'll give a crownnn

Me. drysdale earned 906.25 in interest in one year on money that he had deposited in his local bank if the bank paid an interest rate of 6.25% how much money did mr. drysdale deposit

25 ! the line of best fit is h = 5a + 86. predict the height at age 16. show your work.

Can someone me out here and the tell me the greatest common factor