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19-10-2022
Mathematics

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A student was asked to find m∠A and m∠B given that m∠D=123°, m∠A=(9x−18)°, and m∠B=(10x−11)°. She incorrectly said m∠A=23° and m∠B=34°. Find m∠A and m∠B. What mistake might the student have made?

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