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ZX-3F811EB4602025年3月美国C卷练习 · 第 17 题
2025年3月美国C卷练习 · 原库模块 1 · Q17 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 17 lessons and was charged $480. Which function \( f \) gives the total charge, in dollars, for any student who took x lessons, where \( x>2 \) ?
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