Digital television sales since their introduction into the

Question

Question: Digital television sales since their introduction into the market in the late 1990s, the sales of digital televisions, including high-definition television sets, have slowly gathered momentum. The model

S(t) = 0.164t² + 0.85t + 0.3         (0 ≤ t ≤ 4)

Describes the sales of digital television sets (in billions of dollars) between the beginning of 1999 (t = 0) and the beginning of 2003 (t = 4).

A. Find s(t) and s"(t).

B. Use the results of part (a) to conclude that the sales of digital tvs were increasing between 1999 and 2003 and that the sales were increasing at an increasing rate over that time interval.