Find the derivative of f(x) = -11/x at x = 9

I’m really confused and need your assist me with this question i’ve never been taught

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly

David is standing on the sixth rung of a ladder while painting his house. which expressions represent a change in david’s position of 2 rungs on the ladder? choose exactly two answers that are correct. a. 6+2 b. 6-2 c. 2x6 d. 6/2