a. Write the equation of the line that represents the linear approximation to the following function at the given point a. b. Use the linear approximation to estimate the given quantity. |approximation - exact c. Compute the percent error in the approximation, 100 . , where the exact value is given by a calculator. exact f(x) = 11 - x at a = 2; f(2.1) . . . a. L(x) = - 4x + 15 b. Using the linear approximation, f(2.1) ~ 6.6 (Type an integer or a decimal.) c. The percent error in the approximation is % (Round to three decimal places as needed.)