Question 153707
The idea is to assign a variable to things you don't know.
In this case, every side is related to the "shortest side".  So...
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Let x = length of the shortest side
2x = length of longest side
x+2 = length of the last two sides
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The problem gives us the perimeter as 29 inches:
x + 2x + 2(x+2) = 29
Now, we solve for x:
x + 2x + 2x + 4 = 29
5x + 4 = 29
5x = 25
x = 5 inches (shortest side)
2x = 2(5) = 10 inches (longest side)
x+2 = 5+2 = 7 inches (the two remaining sides)