You may use calculators on the following portion which should take 20 minutes or less. 13. (6 points) Solve graphically: 13x-4)=-4x + 1 Be sure to show the graph you used. 14. (6 points) Solve for z. You may round your answer to no fewer than three decimal places: 2.33(x-4)=(x+2.3) 15) (6 pts) Use your calculator to sketch the portion of the graph of f(x)=x-4 restricting the domain to z 21. The sketch the inverse of this function.