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11-01-2021
Mathematics

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A and B are complementary angles. If A = (x + 9) and m B = (7x – 15)° then find the measure of B.

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Аноним Аноним

11-01-2021

Answer:

[tex]coplementary \: angles \: = 90° \\ (x + 9)° + (7x - 15)° = 90° \\ (8x - 6)° = 90° \\ 8x = 90 + 6 \\ 8x = 96° \\ x = 12\\ angle \: B. = ((7 \times 12)- 15) \\ = 69°[/tex]

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