Which of the following expressions is the inverse of the function y = 3x + 4?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

We just started the introduction into circles and i have no idea how to do this.

Hilary decided to purchase 3 points in order to lower her interest rate on her $140,000 mortgage. how much additional money does she need to bring to closing? a. $4200 b. $4000 c. $6 d. $400