Question

I need help for this problem.

Answer 1

Explanation:

12x+15x+8x+5=180 degree(being sum of interior angles of a triangle)

35x=180-5

x=175/35

x=5

Answer 2

Explanation:

Equation

12x + (8x + 5) + 15x = 180 All triangles have 180o for their interior angles.

12x + 8x + 5 + 15x = 180 Combine like terms on the left

35x + 5 = 180 Subtract 5 from both sides

- 5 -5

35x =175 Divide by 35

x = 5

It's not clear what you want. x = 5 is one possibility

12x = 60

15x = 75

8x+5=45

is another possiblity