What are the missing angles?

Aportion of a hiking trail slopes downward at about an 84° angle. to the nearest tenth of a flot, what is the value of x, the distance the hiker traveled along the path, if he has traveled a horizontal distance of 120 feet? a. 143.3 b. 12.5 c. 120.7 d. 130.2

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

If the value of cos330°is√3/2 then find cos 165°.