could use help with these

\fSolve the following equation for x. 6X = 13Find 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:r 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 $D. (Round to the nearest cent as needed.)