Question

the three side lengths of an isosceles triangle are m, n and m. What equation can be used to find p, the perimeter of the triangle?

Answer 1

There are lots of answers... Is this a multiple choice question? One answer is

2m + n = p

Answer 2

m+n+m

Answer 3

the perimeter of an object is the total distance around the object. in this case, it would be the sum of the three sides of the triangle and the equation would be as @meverett04 has stated, i.e.:
p = 2m + n