13. +91 move the graph up 91. It does that, because 91 is the y intercept. 14. 0.05 mean how wider the graph is going to be and if is going to be open up or down,but in this case the graph will open up and going to be wider. 15. If X-10 is negative real numbers then the graph will shift right 10. And if X+10 is negative real number then the graph will shift left 10.
