Answer: ≈ 103.92 feet
Explanation:
Since this is a right triangle we can use a trigonometry function to help us solve. Here, we will utilize cosine since we are given the hypotenuse and the adjacent side to the angle to work with. Let x be the length of the hypotenuse.
Given:
cos(30°) =

Multiply both sides of the equation by x:
xcos(30°) = 90 feet
Divide both sides of the equation by cos(30°):
x = 103.92304845 feet ≈ 103.92 feet