Answer
The x-value where the ball will be at maximum height = 35
Step-by-step explanation
The maximum height is easily obtainable from the graph by looking at the point where the graph peaks on the y-axis.
The question then asks us to find the corresponding x-coordinate of this point where the graph peaks and the ball reaches maximum height.
Tracing the peak point on the graph down to the x-axis, we see that
The x-value where the ball will be at maximum height = 35
Hope this Helps!!!