could use help with these Find f'(X). f(x) = ex- 18 Solve the following equation for x. e 6X = 13 Find the positive values of x and y that minimize S = x + y if xy = 100, and find this minimum value. If x = and y = , then S is minimized and equal to (Simplify your answers.) How much money must you invest now at 4.7% interest compounded continuously in order to have $10,000 at the end of 4 years? You must invest $ (Round to the nearest cent as needed.)