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ZX-DDCA6A13492025年6月美国B卷 · 第 4 题
2025年6月美国B卷 · 原库模块 1 · Q4 原库参考解析
The function \( f(x)=\frac{1}{9}(x-6)^2+3 \) gives a toy car’s height above the ground \( f(x) \), in inches, x seconds after it started moving on an elevated track, where \( 0\le x\le10 \). Which of the following is the best interpretation of the vertex of the graph of \( y=f(x) \) in the xy-plane?
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