**Consider the function f(x) = √x and the point P (4, 2) on the graph of f**.

(a) Graph f and the secant lines passing through P (4, 2) and Q(x,f(x)) for x-values of I, 3, and 5.

(b) Find the slope of each secant line.

© Use the results of part (b) to estimate the slope of the

tangent line to the graph of f at P (4, 2). Describe how to

improve your approximation of the slope.

**Answer:**