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February 28, 2015

February 28, 2015

Posted by **Rose** on Tuesday, March 12, 2013 at 5:36am.

- algebra -
**bobpursley**, Tuesday, March 12, 2013 at 5:47amhit the ground? then h=0

0=-t^2 + 3t+28=t^2-3t-28=(t-7)(t+4)=0

t=7 seconds

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