Choose the explicit and recursive formulas for the geometric sequence 45, 135, 405, 1215, 3645, … A. an = 45(3)n ; an = 3(an), a1 = 45
B. an = 45(3)n − 1; an = 3(an − 1), a1 = 45
C. an = 45(3)n + 1; an = 3(an + 1), a1 = 45
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Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?

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