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

To find the area of a rectangle, you multiply its length by its width. In this scenario, the rectangle has a length of 10 units and a width of 4 units.

Calculating the area involves the following steps:

1. Multiply the length (10 units) by the width (4 units).

2. This calculation is: 10 units * 4 units = 40 square units.

The area is expressed in square units since it represents a two-dimensional space. Thus, the correct answer is 40 square units, confirming the solution.