Answer:
see explanation
Step-by-step explanation:
Since the triangle is isosceles , then the 2 legs are congruent , that is
5n - 17 = 2n + 1 ( subtract 2n from both sides )
3n - 17 = 1 ( add 17 to both sides )
3n = 18 ( divide both sides by 3 )
n = 6
Then
2n + 1 = 2(6) + 1 = 12 + 1 = 13
each of the congruent sides = 13 cm
the third side has length n = 6 cm
Perimeter = 13 + 13 + 6 = 32 cm