Raymond B. answered • 06/17/21
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x+9 + 7x -15 = 90
8x = 90+6 = 96
x = 96/8 = 12
B = 7x-15= 7(12)-15 = 84-15 = 69 degrees = angle B
Abril E.
asked • 03/30/21math equation for tests
∠ and ∠B are complementary angles. If m∠A=(x+9)∘ and m∠B=(7x−15)∘, then find the measure of ∠B.
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