If a rectangle has a length of 8 and a width of 4, what is its perimeter?

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To determine the perimeter of a rectangle, one can use the formula:

Perimeter = 2 × (Length + Width).

In this case, the length of the rectangle is 8 and the width is 4. So, we first add the length and width together:

Length + Width = 8 + 4 = 12.

Next, we multiply the sum by 2 to find the perimeter:

Perimeter = 2 × 12 = 24.

Thus, the perimeter of the rectangle is 24. This correctly aligns with the choice indicating a perimeter of 24.