If a rectangle has a width of 4 and a length of 10, what is its area?

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

Calculating the area involves the following steps:

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

2. Area = Length × Width = 10 × 4 = 40.

Therefore, the area of the rectangle is 40 square units, which corresponds to the correct answer. Understanding this concept is crucial; the area formula for rectangles is a fundamental aspect of geometry that will be applicable in various mathematical contexts.