Find the volume of each pyramid with the given values.
1. A four-sided pyramid with base edge of 5 ft and h = 4 ft.
2. A four-sided pyramid with base edge of 10 ft and h = 7 ft.
3. A four-sided pyramid with base edge of 8 yds and h = 9 yds.
4. A four-sided pyramid with base edge of 20 ft and h = 15 ft.
5. A four-sided pyramid with base edge of 11 in and h = 20 in.