Surface area of a cube

What is the surface area of a cube that has an edge of 3.5?

Correct answer:

S =  73.5

Step-by-step explanation:

$$\begin{gathered} a=3.5 \\ S=6\cdot a^2=6\cdot 3.5^2={\displaystyle \frac{147}{2}}=73\frac{1}{2}=73.5 \end{gathered}$$

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