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February 28, 2015

February 28, 2015

Posted by **cole** on Monday, November 25, 2013 at 6:37pm.

- algebra -
**Reiny**, Monday, November 25, 2013 at 7:06pmheight of penny = -16t^2 + 5t + 4

to reach bottom of well, h = -100

-16t^2 + 5t + 4 = -100

16^2 - 5t -104 = 0

using the formula:

t = appr 2.7 or a negative, which we'll reject

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