Question 918902
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Hi,
     *[illustration rectangle.png].
A = (w+10)w = 80cm^2
w^2 + 10w - 80 = 0 
(Tossing out the negative solution for unit measure)
w = 5.247 (rounded) and L = 15.247 
P = 2(20.247) cm = 40.247
 *[invoke quadratic "x", 1, 10,-80]