There is a triangle and the first side is 3m, The second side is 4 - m, and the third side is 2m - 1. What expression would represent the perimeter of the triangle?

perimeter = 4m + 3

the perimeter is the sum of the 3 sides of the triangle, thus

perimeter = 3m + 4 - m + 2m - 1 = 4m + 3

Answer: 4m + 3

Step-by-step explanation:

This is because the perimeter of a triangle is the same as adding all of its sides.

3m + (4-m) + (2m-1)

Group like terms:

(3m-m+2m) + (4-1)

Then combine like terms to get your final answer of:

4m + 3