SAT Question 59cb654c: Area and Volume answer and explanation with Desmos solution

Choice A is correct. It's given that the area of a square is $64$ square inches. The area $A$, in square inches, of a square is given by the formula $A=s^2$, where $s$ is the side length, in inches, of the square. Substituting $64$ for $A$ in this formula yields $64=s^2$. Taking the positive square root of both sides of this equation yields $8=s$. Thus, the side length, in inches, of this square is $8$.