SOLUTION: The lenght of a rectangle is fixed at 28 cm. What widths will make the perimeter greater than 100 cm? The width must be greater than ? cm

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Question 146588: The lenght of a rectangle is fixed at 28 cm. What widths will make the perimeter greater than 100 cm?
The width must be greater than ? cm
Answer by jim_thompson5910(21682) About Me  (Show Source):
You can put this solution on YOUR website!
P=2W%2B2L Start with the perimeter formula


P=2W%2B2%2828%29 Plug in L=28


P=2W%2B56 Multiply


2W%2B56%3E100 Set the right side greater than 100


2W%3E100-56 Subtract 56 from both sides.


2W%3E44 Combine like terms on the right side.


W%3E%2844%29%2F%282%29 Divide both sides by 2 to isolate W.


W%3E22 Reduce.


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Answer:

So the answer is W%3E22


So the width must be greater than 22 cm