SOLUTION: the width of a rectangle is fixed at 21 cm. What lengths will make the perimeter greater than 90cm?

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Question 417943: the width of a rectangle is fixed at 21 cm. What lengths will make the perimeter
greater than 90cm?

Answer by praseenakos@yahoo.com(507) About Me  (Show Source):
You can put this solution on YOUR website!
P = 2(length + width)
90+=+2%28+length+%2B+21%29

90%2F2+=+2%28+length+%2B+21%29%2F2
+45+=+length+%2B+21
+45+-21+=+length+%2B+21-21
+24+=+length+ which makes the perimeter 90
so to make the perimeter greater than 90, the length should be more than 24.