What is the area of a rectangle that is 10 units long and 4 units wide?

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

Area = Length × Width.

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

Area = 10 units × 4 units = 40 square units.

This calculation confirms that the area of the rectangle is indeed 40 square units. Each dimension contributes to the overall size of the two-dimensional space contained within the rectangle, and multiplying the length by the width provides the total area. The correct answer reflects this product accurately, whereas the other options present different values that result from incorrect calculations or misunderstandings of the area formula.