What is the total area of a rectangle that is 5 units long and 3 units wide?

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

Area = length × width.

In this case, the length of the rectangle is given as 5 units, and the width is 3 units. By applying the formula:

Area = 5 × 3 = 15 square units.

This calculation shows that the total area of the rectangle is 15 square units, confirming that the correct answer is indeed B. Understanding the formula for the area of a rectangle is essential for solving similar problems, as it allows you to calculate the area whenever you know the dimensions.