Pleas someone help me just the number 1-3-5-7

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

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

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3