Ajogger runs north for 3 miles. if this took 2 hours, what is the joggers average velocity? draw a properly labeled diagram.

The jogger runs 3 miles in 2 hours.
If graphed, the x-axis would be time and the y-axis would be miles jogged
Let's think of this in terms of slope (rise/run). The slope, and the average velocity, would be 3miles/2hours, or 1.5 miles/hour. 

We can graph this as a diagram using the slope-intercept form y=mx +b
Remember that m is the slope, 1.5, and b is the y-intercept. In this case, b=0 since she starts from a position of zero.
y= 1.5x
This is the equation that you would graph in the diagram.
Here are a couple of points of interest to help with the graphing:
(0,0), (1,1.5), (2,3), (3,4.5)

The rocks expand when there hot/warm  and contract when they are cold.