Help with maths homework please

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

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

The solution set for 5v2 – 125 = 0 is