Question

what is the surface area of a cube with an edge length of 8 inches? 288 in.² 192 in.² 384 in.² 512 in.²

Explanation:

Step1: Recall surface - area formula

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

Step2: Substitute the given value

Given $a = 8$ inches. Substitute $a = 8$ into the formula $S=6a^{2}$, we get $S = 6\times8^{2}$.

Step3: Calculate the result

First, calculate $8^{2}=64$. Then, $6\times64 = 384$ square inches.

Answer:

C. $384$ in.$^{2}$