Roanoke (R), Charlottesville (C), and Petersburg (P), from a triangle and the distance between the three cities are represented on the map below.

List the angles in order from greatest to least.
The lengths of two sides of triangle ABC are listed below:
AB=68
BC=20
What is the range of the length of AC?
What is the slope of a line parallel to CD with C(-3,4) and D(7,-2)