Evaluating a derivative when x is -1 [-1/2x+4]

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

Given right triangle xyz, which correctly describes the locations of the sides in relation to

What expression is equivalent to log3(x+4)