Write an expression for the perimeter of the triangle shown below: A triangle is shown with side lengths labeled 2.3x plus 14, 2x, and negative 0.2x plus 15.

The perimeter is just the sum of all the side lengths.

So let's get to work and addum up:

(2.3x + 14) + (2x) + (-0.2x + 15)

Add up all the x's: (2.3x + 2x - 0.2x) = 4.1x

Add up all the ordinary numbers: (14 + 15) = 29

So the perimeter is simply 4.1x + 29.