If you simplify 4/6, it comes out to 2/3. Basically because of the fraction size, it looks like Mary ate more because of the simplified denominator of 4/6 is smaller. Luis actually ate more pizza than Mary.
(2, -5) is the mid point
(3, 6) is (2+1, -5+11) is an end point
therefor the other end point should be (2-1, -5-11) = (1, -16)
You could visualise this better if you draw it
Hope this helps, I don't really know a better way to explain it, sorry =P
Answer:

Step-by-step explanation:
Given:
--- Position
--- Change
Required
Find the new position
The new position is calculated as:






9.76 dollars.
1.22 dollars is the cost for each pound.
1:100 could be an example of a ratio comparing to 100