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ZX-F1EE110CD02026年3月国际B卷 · 第 16 题
2026年3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 6 lessons and was charged $150. Another student took 14 lessons and was charged $390. Which function \( f \) gives the total charge, in dollars, for any student who took x lessons, where \( x>2 \)?
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