Please I need the answers! 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.