Answer
See graph
Work Step by Step
We are given the function:
$$P(t)=0.138t^4-6.24t^3+86.8t^2-239t+1450,0\leq t\leq 22.$$
We make a table of values for the function $P$:
\[ \begin{array}{|c|c|}
\hline
t& P(t) \\
\hline
0 &1450\\
\hline
2 & 1271.5\\
\hline
4 & 1518.7\\
\hline
6 & 1971.8\\
\hline
10 & 2880\\
\hline
14 & 3295.6\\
\hline
18 & 3366.2\\
\hline
22 &4087.0\\
\hline
\end{array}\]