A table of values of an increasing function $f$ is shown. Use the table to find lower and upper estimates for $\int_{0}^{\,25} {f(x)}\, dx.$ $$\begin{array}{|c|c|c|c|c|c|c|}\hline x & 0 & 5 & 10 & 15 & 20 & 25 \\ \hline f(x) & -42 & -37 & -25 & -6 & 15 & 36 \\ \hline \end{array}$$

Lower estimate =

Upper estimate =