See the attached figure to better understand the problem
we know that
in the triangle ABC
tan 61=BC/AC-------> BC=AC*tan 61--------> BC=55*tan 61-----> BC=99.22 ft
tall of the tree =BC+CD-----> 99.22+4.5----> 103.72 ft------> 104 ft
the answer is
104 ft
we know that
in the triangle ABC
tan 61=BC/AC-------> BC=AC*tan 61--------> BC=55*tan 61-----> BC=99.22 ft
tall of the tree =BC+CD-----> 99.22+4.5----> 103.72 ft------> 104 ft
the answer is
104 ft