The height y, in feet, of a football x seconds after it is thrown is modeled by the equation y = –16x2 + 24x + 1. What information does the zero of the equation 6 = –16x2 + 24x + 1 represent?

The equation models the ball’s height y at time x. Setting y equal to 6 gives 6 = –16x² + 24x + 1, so its solutions are the times when the ball is 6 feet above the ground. Therefore, the equation’s zero represents when the ball is 6 ft above the ground, choice B.

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