mathword problem
posted by Michelle .
The width of a rectangle is fixed at 21cm. What lengths will make the perimeter greater than 80cm.
Please help with this word problem I do not even know where to begin.

The perimeter is the distance around the rectangle.
P = 2L + 2W
Two widths = 42 cm.
80  42 = 38
38/2 = 19
The length must be over 19 cm. 
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