Answer:
m∠A = 21°
m∠B = 84 °
m∠C = 75 °
Explanation:
21°, 84°, 75° are the angles
Total angle in a triangle is 180.
x + 4x + (5x - 30) = 180
10x - 30 = 180
10x = 210
x = 21°
Angles are:
A: 21°
B: 4(21) = 84°
C: 5(21) - 30 = 75°
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