Refer to Example 5.

(a) Compute S(10) and S(10).

(b) Use the data in part (a) to estimate the total sales on January 11. Compare your estimate to the actual value given by S(11)

Example 5

At the end of the holiday season in January, the sales at a department store are expected to fall (Fig. 3). It is estimated that for the x day of January the sales will be

S(x) = 3 + 9 (x + 1) thousand dollars.