Factor. Check by multiplying.7 + 70a + 63b
A. 7(0 + 10a + 9b)
B. 70(1 + a + b)
C. 7(1 + 70a + 63b)
D. 7(1 + 10a + 9b)
Answer: D
Mathematics
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A. - 
B. 
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