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October 20, 2014

October 20, 2014

Posted by **HELP HELP HELP MNHS** on Sunday, January 6, 2013 at 11:46pm.

(pls write the solutions.... thanks)

- AREA -
**Reiny**, Monday, January 7, 2013 at 8:35amoriginal size of lobby : x m by x m

new size = x-2 by x+2

area = (x-2)(x+2) = x^2 - 4

cost equation:

160(x^2 - 4) = 35360

x^2 - 4 = 221

x^2 = 225

x = ± 15 , but x must be positive, so

x = 15

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