Answer:
14.3 feet
Explanation:
Let the height of the tree = x feet.
It is given that the horizontal distance from the base of tree = 10 feet and the angle of elevation to the nest is 55°.
So, we get the following figure.
As, we are obtaining a right angled triangle.
Using the trigonometric form for the angles of a right angled triangle, we get,

i.e.

i.e.

i.e.

i.e.

Hence, the height of the tree is 14.3 feet.