Answer
Concave down
Work Step by Step
The rate of change between $t=0.2$ and $t=0.4$ is
$$
\frac{\Delta p(t)}{\Delta t}=\frac{-2.32-(-3.19)}{0.4-0.2}=4.35
$$
Similarly, we have
$$
\begin{gathered}
\frac{\Delta p(t)}{\Delta t}=\frac{-1.50-(-2.32)}{0.6-0.4}=4.10 \\
\frac{\Delta p(t)}{\Delta t}=\frac{-0.74-(-1.50)}{0.8-0.6}=3.80 .
\end{gathered}
$$
The rate of change is decreasing, so we expect the graph to be concave down.
