3 (9+x) = 51

How would you do this

A parallelogram has an interior angle measuring 81º. Which MUST also be the measure of an interior angle of the parallelogram? A) 9°. C) 49° B) 19° D) 99°

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What should Andrea conclude about this system of equations?

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If there are 18644 students in the college and 1/4 of them take speech, how many of the students take speech?