Answer:
x = 15
Step-by-step explanation:
All angles add up to 180
so,
2x + 4x + 10 + 6x - 10 = 180
combine like terms
12x = 180
divide by 12
x = 15
check it by plugging it in
2x = 2(15) = 30
4x + 10 = 4(15) + 10 = 70
6x - 10 = 6(15) - 10 = 80
30 + 70 + 80 = 180
