SAT Question 17049054: Area and Volume answer and explanation with Desmos solution

Choice B is correct. The area of a square is $s^2$, where $s$ is the side length of the square. It’s given that the length of a side of square X is $9$ centimeters. It follows that the area of square X is $9^2$, or $81$ square centimeters. It’s also given that the area of rectangle Y is $32$ square centimeters. Therefore, the total area, in square centimeters, of square X and rectangle Y is $81+32$, or $113$.