geometry
posted by Anonymous .
an isosceles triangle has a perimeter of 136 inches. If one of its equal sides measures 42 inches, what is the measure of the nonequal side?

Let the sides be A, A and B.
A being one of the equal sides, and B the third side.
"an isosceles triangle has a perimeter of 136 inches."
means that
A+A+B = 136 .... (1)
and
"If one of its equal sides measures 42 inches"
means A=42, this makes equation (1):
42+42+B = 136
and we look for the value of B.
Can you take it from here? 
b=52