A farmer needs to build a goat pen. The pen will be 7 yards wide and 12 yards long. The fencing material costs $1.33 per yard. H
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-16t^2+400=0
16t^2=400
take square root on both sides.
4t=20
t=20/4
t=5
-16t^2+400=0
16t^2=400
take square root on both sides.
4t=20
t=20/4
t=5