If that's supposed to be a rectangle, then multiply length x width. That will give you the area, in this case in square feet.
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6.5625
Volume = 35 ft*105 ft*140 ft = 35/3 yds * 105/3 yds * 140*3 yds = 19055.55... cubic yards.
16 subtracted from 105 = -89
16/105 is in its simplest form.
16*32*6 = 3072 cubic feet is needed