SAT Question bb560789: Area and Volume answer and explanation with Desmos solution

Choice D is correct. It's given that triangle R has an area of $80$

${\text{cm}}^2$. The area of a square is $l^2$, where $l$ is the side length of the square. It's given that square S has side lengths of $4$ cm. It follows that the area, in ${\text{cm}}^2$, of square S is $4^2$, or $16$. Therefore, the total area, in ${\text{cm}}^2$, of triangle R and square S is $80+16$, or $96$.