Question

A triangle has side lengths of (2t - 4) centimeters, (7t - 2) centimeters, and (2u+7) centimeters. Which expression represents the perimeter, in centimeters, of the triangle?​

Answer 1

9t + 2u + 1

Explanation:

You are combining your like terms.

You have:

2t + 7t = 9t

You have:

Only 2u and no other u terms

You have:

-4 + (-2) + 7 = +1

Combine that all together and you have your answer.

Answer 2

Perimeter = 11t + 1

Explanation:

Perimeter of a triangle = lenght of side 1 + lenght of side 2 + lenght of side 3

Then:

perimeter = (2t-4) + (7t-2) + (2t+7)

perimeter = 2t + 7t + 2t + 7 - 2 - 4

perimeter = 11t + 1