9 * 10 to the fourth power - 7 * 10 to the second power
1 answer:
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When the ball hits the ground, the height is 0.
0 = 100 - 16t²
0 = (10 - 4t)(10 + 4t)
0 = 10 - 4t or 0 = 10 + 4t
4t = 10 or -4t = 10
t = or t =
Time cannot be negative (unless you have a time machine) so disregard
Answer: t = = 2.5 seconds
Answer:
21 minutes
Step-by-step explanation:
To cut a 5-ft log into 5 equal peices, you need to make 4 cuts (each cut cuts one piece from a whole log, the last cut divides the remaining log into two pieces).
If it takes minutes to make one cut, then it takes
minutes to cut the log into 5 equal pieces.