Question

A triangle has side lengths of (6.5r + 4.2)centimeters, (2.4r - 9.8) centimeters, and (9.5s-5.2) centimeters. Whichexpression represents the perimeter, in centimeters, of the triangle?

Answer 1

we know that

The perimeter of a triangle is the sum of its length sides

step 1

Adds the length sides

so

(6.5r+4.2)+(2.4r-9.8)+(9.5s-5.2)

group terms

(6.5r+2.4r)+(9.5s)+(4.2-9.8-5.2)

(8.9r+9.5s-10.8) centimeters

This expression represents the perimeter