Hello, magentarita!

The graph is a down-opening parabola. .Its maximum is at its vertex.Vanessa throws a tennis ball in the air.

The function represents the distance, in feet,

that the ball is from the ground at any time .

At what time, to the nearest tenth of a second, is the ball at its maximum height?

The vertex is: .

The ball is at maximum height in about 1.4 seconds.