math 8th grade
posted by cody gilliam on .
One of a pentagon's sides is 3 feet longer than the other. If the perimeter of the pentagon is 128m, how long is the longest side?

I assume you mean "the others." A pentagon has 5 sides.
4s + s + 3 = 128
5s + 3 = 128
Subtract 3 from both sides.
5s = 125
Divide both sides by 5.
s = 25
s + 3 = ?