Write and simplify an expression for the perimeter of the triangle. side A)3x, side B) 5x-4 and side C)2x+5.

Thank you!

First, start out by simply adding the sides together into a single equation:

3x+5x-4+2x+5

Next, combine like items:
3x+5x+2x = +10x
-4+5 = +1

That would leave you with:
10x+1

That is as simplified as it gets, so that means you have your answer now.