Find the first term and the common ratio of the geometric sequence.-9, 9, -9, 9, -9, . . .
A. a1 = -9, r = -1
B. a1 = -9, r = 1
C. a1 = -1, r = 9
D. a1 = -1, r = -9
Answer: A
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B. 
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D. 
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