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

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 units and the width is 4 units. Plugging these values into the formula gives:

Perimeter = 2 * (10 + 4)

Perimeter = 2 * 14

Perimeter = 28 units

Therefore, the perimeter of the rectangle is 28 units, which corresponds to one of the choices. The calculation demonstrates how to correctly apply the perimeter formula, adding the length and width together and then multiplying the sum by 2 to find the total perimeter.