16. (5 points) Solve the equation: 10 Ixl =_ 1 1000 17. (6 points) Find the x-values of all points where the function has any relative extrema. Find the values of the extrema (y-values). Indicate if the extrema are maxima or minima. f (x) = x4-72x2 -7 18. (6 points) Find the integral: f(m) = S dm Bonus: A manufacturer of music CD's charges p(x) dollars per CD sold, where p(x) = 12 - - and x is the number of CD's sold. a) Find an expression for the total revenue from the sale of x thousand CD's (the number of CD's sold = 1000x). b) What value of x will lead to maximum revenue? c) What is the maximum revenue