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ZX-B7590E91952025年3月美国B卷 · 第 7 题
2025年3月美国B卷 · 原库模块 2 · Q7 原库参考解析
The function \( T\left(x\right)=\frac{20,000-6.5x}{1,000} \) gives the estimated air temperature \( T\left(x\right) \), in degrees Celsius \( \left(°C\right) \) , surrounding a hot air balloon at an altitude of x meters. If the estimated air temperature surrounding the hot air balloon is \( 15\ °C \), which of the following is closest to the altitude, in meters, of the hot air balloon?
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