SOLUTION
We want to find how far from the thrower does the ball hit the ground.
From the equation
[tex]h(x)=-\frac{1}{20}x^2+8x+6[/tex]
To solve this, let us graph the function
From the graph the parabola describes the motion of the ball. So, it hits the ground again (the x-axis plane) at 160.747
Hence the answer is 160.75 feet to 2 decimal places.
