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ZX-9E946C545B2025年10月美国A卷(数易) · 第 15 题
2025年10月美国A卷(数易) · 原库模块 2 · Q15 原库参考解析
The function \( f\left(x\right)=-40x+340 \) gives the predicted height above the ground \( f\left(x\right) \), in feet, of a model airplane x minutes after it begins to descend. What is the predicted height above the ground, in feet, of the model airplane 3 minutes after it begins to descend?
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