TESTTT RNn WILL GIVE BRAINLESS

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

At which value in the domain does f(x) =0?

Solve the system of equations. y= 2x y= x^2 - 15