###### Exercise31

Evaluate the following expressions.

1. Evaluate $${x^{2}r^{3}}$$ when $$x=-3$$ and $$r=-1\text{.}$$

$$\displaystyle{{x^{2}r^{3}}=}$$

2. Evaluate $${x^{3}r^{2}}$$ when $$x=-3$$ and $$r=-1\text{.}$$

$$\displaystyle{{x^{3}r^{2}}=}$$

in-context