Find a single expression that represents the perimeter of the triangle.

The correct answer is 9x-3.
Perimeter is all of the sides added together. Add by combining like terms (all terms that are constant and all terms with an x)
Answer:
Perimeter = 9x - 3
Step-by-step explanation:
Perimeter of a triangle is the sum of length of the three sides
Therefore in this case
Perimeter of this triangle = 4x -2 + 3x - 1 + 2x
perimeter = 4x + 3x + 2x - 2- 1
Perimeter = 9x - 3