What are the missing values for 15? 20? 23? How did you get those?

Afunction is given: f(x)=3x+12 a. determine the inverse of this function and name it g(x) b. use composite functions to show that these functions are inverses. c. f(g(– explain: what is the domain?

Can someone me with my hwplz(only the circled ones)

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x