I need 15 and 17 please fast help

What is the inverse of the function f(x) = 2x + 1?

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

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5