(a) Graph the function f(x) = x + 4/x in the viewing rectangle [0, 10] by [0, 10].
(b) Graph the secant line that passes through the points (1, 5) and (8, 8.5) on the same screen with f.
(c) Find the number that satisfies the conclusion of the Mean Value Theorem for this function f and the interval [1, 8] then graph the tangent line at the point (c, f(c))and notice that it is parallel to the secant line.