Here's how to calculate the volume of the pyramid:

1. Find the Area of the Base:

* The base is a square with sides of 4 feet.

* Area of a square = side * side = 4 feet * 4 feet = 16 square feet

2. Calculate the Volume:

* Volume of a pyramid = (1/3) * (area of the base) * (height)

* Volume = (1/3) * (16 square feet) * (5 feet)

* Volume = 80/3 cubic feet

Therefore, the volume of the pyramid is approximately 26.67 cubic feet.