Exercise 53.1 Determine the linear approximation L(x) at a of each function below. Then use L(x) to approximate the value of each function at the given x- value. (c) f(x) a = 5, x 5.3 Exercise 5.3.3 Use linear approximation to estimate (l .9)3 Exercise 5.3.9 Use differentials to approximate the given quantity. Exercise 5.3.9 Use differentials to approximate the given quantity.