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ZX-5B7731DB442026年6月国际C卷练习 · 第 2 题
2026年6月国际C卷练习 · 原库模块 2 · Q2 参考答案
The equation \( y=−4.9(x−9.1)^{2}+12,400 \) gives the estimated height above ground, y, in meters, of a plane, where x is the number of seconds since it started a parabolic maneuver. If this equation is graphed in the xy-plane, which of the following is the best interpretation of the vertex of the graph?
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