Rise
___
run
y2-y1
____
x2-x1
-1-4
___
2--2
-5
___
4
rise: -5
run: 4
None.
The absolute value of something cannot be <em>negative</em>.
8. 5, 6, 3, -5
9. Winter, Colder
10. 5, 6, 10, 12, 7
11. Units squared and Units cubed, the difference is that with cubed you're getting the area of three planes instead of two.