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Eugene and Penny started a job in sales on the same day. Eugene's sales for the first month were $$r$$ dollars and each month after the first his sales for that month were twice his sales for the preceding month. Penny's sales for the first month were $$10r$$ dollars, and each month after the first her sales for that month were $$10r$$ dollars more than her sales for the preceding month. Which of the following statements are true?
Indicate all such statements.
A,B,C显示答案
· 相关考点
6.2.2 等比数列 6.2.1 等差数列 7.2.3 GRE数学170脏题
6.2.2 等比数列
6.2.1 等差数列
7.2.3 GRE数学170脏题
以上解析由 考满分老师提供。
