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ZX-066AB6ADE82025年12月国际B卷 · 第 16 题
2025年12月国际B卷 · 原库模块 1 · Q16 原库参考解析
A dance studio charges an introductory fee for the first 3 lessons and then charges a fixed fee for each additional lesson. One student took 4 lessons and was charged $60. Another student took 16 lessons and was charged $300. Which function \( f \) gives the total charge, in dollars, for any student who took x lessons, where \( x>2 \)?
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