1. Describe your graph, is it linear or nonlinear? What is the slope of the graph and what are the units of the slope?
You have a history of posting copyrighted material. I expect this is more of that.
What does linear mean? If you do not know, google it.
Gradient is rise over run. There would be a multitude of sites and youtube clips explaining this.
I'm quite sure you can attempt this question on your own.