Simplify, if possible, by combining like terms.9a + 7b + 4a 

A. 13a + 7b
B. 13a + 4b 
C. 13a + 7
D. 20ab

Answer: A

Mathematics

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D. (3 - ?)

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A. right B. obtuse C. straight D. acute

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A. 1
B.
C. - 
D. -1

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A. 2y2 B. 2y C. 6y2 D. 6

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