Answer:
About 3000 feet
Explanation:
This is a 30,60 90 triangle, all the angles in a triangle adds up to 180.
Use sin ratio
sin 60 =
o for opposite side of triangle from the 60 degree angle
o = 4000 (sin 60) = 3464.11
Use cosine
cos 30 =
a for adjacent side of triangle from the 30 degree angle
3464.11 (cos 30) = 3000.01