Write the surface area S of a cube as a function of the length x of one of its edges, and use it to find the surface area (in square inches)when $x = 5$ inches.
A) $S ( 5 ) = 25$ square inches
B) $S ( 5 ) = 750$ square inches
C) $S ( 5 ) = 30$ square inches
D) $S ( 5 ) = 100$ square inches
E) $S ( 5 ) = 150$ square inches

Question

Quizplus · Accepted Answer

The surface area $S$ of a cube as a function of the length $x$ of one of its edges is given by $S(x) = 6x^2$. Substituting $x = 5$ inches, we get $S(5) = 6 \times 5^2 = 6 \times 25 = 150$ square inches.

Write the Surface Area S of a Cube as a Function