What is the perimeter of a rectangle with a length of 10 and a width of 4?

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To find the perimeter of a rectangle, you can use the formula:

Perimeter = 2 * (Length + Width).

In this case, the length of the rectangle is 10, and the width is 4. Plugging these values into the formula gives:

Perimeter = 2 * (10 + 4) = 2 * 14 = 28.

This means that the perimeter of the rectangle is 28 units. This matches the choice provided and confirms that it is the correct answer.