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February 1, 2015

February 1, 2015

Posted by **laura** on Friday, April 13, 2012 at 9:45am.

- precal -
**Henry**, Saturday, April 14, 2012 at 10:36amP(x) = 10x - x^2 - 1 = 15.

-x^2 + 10x - 1 - 15 = 0.

-x^2 + 10x - 16 = 0.

Solve using Quadratic Formula and get:

X = 2 = 200 Phones.

X = 8 = 800 Phnes.

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