Customers of a phone company can choose between two servers plans for a long-distance calls. The first plant has $27 monthly fee
and charges an additional $0.07 for each minute of calls. The second plan has no monthly fee but charges $0.11 for each minute of calls. For how many minutes of calls with the cost of the two plans be equal?
Given: f(x)=(2x-2)/4 find f^-1(3)? we need to find the inverse of f(x), so x=(2y-2)/4 2y-2=4x y-1=2x y=2x+1 so, then f^-1(x)=2x+1 f^-1(3)=2(3)+1 =6+1 =7 so, the answer is 7