3. Let f(x) = 100e-2/10 - 0.1. a) Find all (approximate) values c which satisfy the Mean Value Theorem on the interval [0, 20]. b) Illustrate the MVT by sketching the graph of f, the secant line from x = 0 to x = 20, and the tangent line at the c-value(s) found in a). (Problem 4 on the next page)