I can not draw you a picture. However I will describe how you could draw the parabola.

We will assume that the tree is the y-axis.

Also, the roof meets the tree at the origin point (0,0)

The tree stands 190 feet above the roof.

Then the maximum of the parabola is the point ( 0, 190)

Now the distance between the roofs will represent the distance on the x-axis.

The distance is 300 feet.

The tree is half way between the roofs.

==> The roofs if 150 feet from the origin point if opposite directions.

Then the points ( 150, 0) and ( -150, 0) represent the roofs.

Then, The parabola is facing down .

==> y = -ax^2 + b

We will substitute the point (0, 190)

==> y(0) = b = 190

==> y = -ax^2 + 190

Now we will substitute with (150, 0)

==> y( 150)= -a(150)^2 + 190 = 0

==> a = 190/ 150*150 = 19/2250

**==> y= (-19/2250) x^2 + 190**

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