Question 87041
The width of a rectangular playground is 2x-5feet and the length is 3x+9 feet. Write a polynomial P(x) that represents the perimeter and then evaluate this perimeter polynomial if x is 4 feet. 
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Perimeter = 2*length + 2*width
Perimeter = 2(length + width)
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Your problem:
perimeter = 2(3x+9+2x-5) = 2(5x+4) = 10x+8
If x = 4 then perimeter = 10*4+8 = 48 feet.
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Cheers,
Stan H.