



 
Hi Harold, I drew a rough sketch of the three dimensional region you want to fill with soil. The volume of this region is the area of the triangular crosssection, times the length of 80 feet. To obtain the volume in cubic feet you need all the dimensions in feet and hence the volume is \[\frac{22}{2} \times \frac{1}{2} \times 80 = 440 \mbox{ cubic feet.}\] There are 27 cubic feet in a cubic yard so if you want the volume in cubic yards divide 440 by 27. I hope this helps,  


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