Answer:
height of tree is 80 feet. 
Explanation:
Given:-
- Distance of point from tree's foot:- 50 feet
 - Angle of elevation:- 58 degrees
 
To find :-
Solution:-
In the given figure we can see that AB is perpendicular , BC is base and AC is hypotenuse.
We know , 
tan 58° = AB/BC
1.6 = AB/50 feet
(Cross Multiplication)
80 feet :- AB
Note:- Figure is in attachment and is a rough work.