Question

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

Step2: Substitute the edge - length value

Given $a = 8$ inches, substitute it into the formula: $S=6\times8^{2}$.

Step3: Calculate $8^{2}$

$8^{2}=8\times8 = 64$.

Step4: Multiply by 6

$S = 6\times64=384$ square inches.

Answer:

C. 384 in.$^{2}$