Math problem?

Question

One would think that the more avocado trees planted per acre, the higher the yield of avocados. However, this is not the case. When more than a certain number of trees are present per acre, they tend to crowd one another and the yield per tree drops. The formula:

y=-0.01x^2+0.8x

Models the yield, y, in bushels of avocados per tree, when x trees are planted per acre. Graph the resulting parabola and calculate the coordinates of the vertex. Then describe what the vertex represents in practical terms.

Answer 1

And how exactly are we to graph the parabola on here? Like this?

|

|                  *

|                *  *

|              *       *

_____________

:)