Answer:
66.9 ft
Step-by-step explanation:
Kite string forms a right triangle with the horizontal 3.5 feet off of the ground
sin 25  = opp / hyp  = height / 150
sin 25 = height / 150
150 sin25 = height    but it is 3.5 feet off of the ground...add that in
3.5 Â + 150 sin25 = true height = ~ 66.9 ft