he Pyramid of Khufu (also known as the Great Pyramid of Giza) is the oldest of the Seven Wonders of the Ancient World. It is also the tallest of the three Giza pyramids in Egypt. The pyramid took 20 years to construct, ending around 2560 B.C. When it was built, it has a height of 481 feet and a square base with side length of 756 feet. Assume that the stone used to build it weighted 150 pounds per cubic foot. (1) How much work was required to build the pyramid? consider only vertical distance. (2) Assume that the pyramid builders worked 12 hours each day for 330 days a year for 20 years and that each worker did 200 foot-pounds of work per hour. Approximately how many workers were need from start-to-finish for the building.

1. PYRAMID OF KHUFU The Pyramid of Khufu (also known as the Great Pyramid of Giza) is the oldest of the Seven Wonders of the Ancient World. It is also the tallest of the three Giza pyramids in Egypt. The pyramid took 20 years to construct, ending around 2560 B.C. When it was built, it has a height of 481 feet and a square base with side length of 756 feet. Assume that the stone used to build it weighted 150 pounds per cubic foot. (1) How much work was required to build the pyramid? consider only vertical distance. (2) Assume that the pyramid builders worked 12 hours each day for 330 days a year for 20 years and that each worker did 200 foot-pounds of work per hour. Approx- imately how many workers were need from start-to-finish for the building of the pyramid