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ZX-E385F46F852025年3月国际D卷练习 · 第 16 题
2025年3月国际D卷练习 · 原库模块 2 · Q16 原库参考解析
A painting studio is offering a promotion where the first class is free, the second class is half off the regular price, and the remaining classes are regularly priced. If the regular price of a class is $26.40, which function \( f \) gives the total cost, in dollars, of x classes taken using this promotion, where \( x\ge2 \) ?
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