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ZX-C9ED3EB0462024年5月C卷 · 第 21 题
2024年5月C卷 · 原库模块 2 · Q21 原库参考解析
The cost of renting a piece of equipment is $78n for the first day and $39n for each additional day, where n is a positive integer. Which of the following functions gives the cost C(x), in dollars, of renting this equipment for x days, where x is a positive integer?
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