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A firecracker shoots up from a hill 145 feet high with an initial speed of 80 feet per second. Using the formula H(t) = -16t2 + vt + s, approximately how long will it take the firecracker to hit the ground?
answered Nov 6, 2017
5 votes
70.6k views
what is the meaning of the prefix in the word contradict? a. against b. opposite c. without d. between
answered May 4, 2017
1 vote
87.6k views
Why do purines pair with pyrimidines?
answered May 20, 2016
6 votes
154k views
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