Question

A triangle has side lengths of (2.9n-7.8p)(2.9n−7.8p) centimeters, (6.6n-6.4q)(6.6n−6.4q) centimeters, and (2.9q-3.8p)(2.9q−3.8p) centimeters. Which expression represents the perimeter, in centimeters, of the triangle?

Answer 1

the perimeter = sum of sides
just add the three given expressions represented by the sides of the triangle
(6.6n - 6.4q) + (2.9n-7.8p) + (2.9q−3.8p) = perimeter