Answer:
1) Unit rate = 20
2) Unit rate = 4
3) Unit rate = 1.5
4) Unit rate = 6
Explanation:
I don't have the time to show work for each and every one of your questions but I will try to my best to explain how it's done!
Unit rate in math means slope and the slope formula is

Where
is the first point and
is the second point!
For example
(-3, -4) and (1, 8)

Note: Two negative signs make a positive which means addition

Simplify

the slope is 3 and that's how you find the slope or unit rate