Question 432571
From a point on the ground, your line of sight to the top of the tree forms a right triangle from where you are to the base of the tree. Thus, 60^2+h^2=(2h+4)^2.

3600+h^2=(2h+4)^2
3600+h^2=4h^2+16h+16
0=3h^2+16h-3584
0=(3h+112)(h-32)
h=-112/3, 32

Throwing out the negative result, we get the height of the tree to be 32 ft.
*[invoke quadratic "x", 3, 16,-3584 ]