SAT Question 25cc5327: Area and Volume answer and explanation with Desmos solution

It’s given that the base of the right rectangular pyramid has a length of $27$ centimeters and a width of $2$ centimeters and that the height of the pyramid is $7$ centimeters. The volume, $V$, of a right rectangular pyramid is given by the formula $V=\frac{1}{3}lwh$, where $l$ and $w$ are the length and width, respectively, of the pyramid’s base and $h$ is the height of the pyramid. Substituting $27$ for $l$, $2$ for $w$, and $7$ for $h$ in this formula yields $V=\frac{1}{3}(27)(2)(7)$, or $V=126$. Therefore, the volume, in cubic centimeters, of the pyramid is $126$.