To find how many cubic feet we need to find the volume of the flower bed. The volume is given by:
[tex]V=Bh[/tex]where B is the area of the base and h is the height.
In this case the height would be 3 inches (0.25 ft) and the area of the base is:
[tex]B=\frac{1}{2}\cdot6\cdot6=18[/tex]Therefore the volume is:
[tex]V=18\cdot0.25=4.5[/tex]Hence we need 4.5 cubic feet of mulch
