bring the like terms together,
Answer:
c
Step-by-step explanation:
7.5
10x + 8x + 6x = 180°
24x = 180°
x = 180°÷24
× = 7.5
20
the whole angle needs to be 180 degrees 180-100=80 80-20=60 20×3=60 60+20=80 80+100=180
