Answer:
side lengths are 34 ft, 52 ft, 68 ft
Step-by-step explanation:
Let s represent the length of the shortest side. Then the other two sides have lengths 2s and (s+18). Their total length, the perimeter, is ...
s + 2s + (s+18) = 154 . . . . . the perimeter is the sum of side lengths
4s = 136 . . . . . . . . . . . . . . . collect terms, subtract 18
s = 34 . . . . . . . . . . . . . . . . . divide by 4, then figure the other lengths
2s = 68
s+18 = 52
The side lengths of the triangle are 34 feet, 68 feet, and 52 feet.
