Question

I don't understand how to do this​

Answer 1

Explanation:

3x+5x-40+2x+20=180°{sum of triangles}

10x-20=180

10x=180+20

x=200

10

x=20°

hope it helps.

Answer 2

20 degrees

Explanation:

You know that the three angles will add up to 180 degrees, so you can make an equation:

3x (angle 1) + 2x + 20 (angle 2) + 5x - 40 (angle 3) = 180

3x + 2x + 20 + 5x - 40 = 180

Then, solve

combine like terms

10x - 20 = 180

add 20 to both sides

10x = 200

divide both sides by 10

x = 20 degrees