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Answer:
x = 10
Step-by-step explanation:
2x + 7x + 9x = 180°
18x = 180°
1/8 18x = 180° 1/8
18x = 108°
18 18
x = 10
<1 = 2x <2 = 7x
<1 = 2 (10) <2 = 7 (10)
<1 = 20 <2 = 70
<3 = 9x
<3 = 9 (10)
<3 = 90
Hope it helps you!