Question 4 • Advanced Algebra: Concepts and Connections
A parabola with vertex (5, 120) has the form y = a(x − 5)² + 120. Using the boundary point (25, 80), we get 80 = 400a + 120, so a = −0.1. Since later experiments met or exceeded the path, their points satisfy y ≥ −0.1(x − 5)² + 120, which is choice C.
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