The surface area of a cube is calculated using the formula:

$\text{Surface Area} = 6 \cdot \text{side length}^2$

Given that $s$ represents the side length of the cube, the correct expression for the surface area is:

$6 \cdot s^2$

So, the correct answer is:
6 • s²

Would you like further details or explanations?

Here are 5 related questions:

1. What is the formula for the volume of a cube?
2. How does surface area differ from volume?
3. If the side length of a cube doubles, how does the surface area change?
4. How do you calculate the surface area of a rectangular prism?
5. Can the surface area of a cube ever be smaller than its volume?

Tip: Always distinguish between area and volume formulas. Surface area involves square units, while volume involves cubic units!