Question

what is the surface area of the cube? 40 ft. 40 ft. 40 ft. square feet

Explanation:

Step1: Recall surface - area formula

The surface area formula of a cube is $SA = 6s^{2}$, where $s$ is the side - length of the cube.

Step2: Substitute side - length value

Given $s = 40$ ft, substitute it into the formula: $SA=6\times40^{2}$.

Step3: Calculate the result

First, $40^{2}=40\times40 = 1600$. Then, $6\times1600 = 9600$ square feet.

Answer:

9600