Anna is x years old and her sister is 5 years older. How old was her sister 5 years ago? (principal test RSM)

Data are collected to see how many ice-cream cones are sold at a ballpark in a week. day 1 is sunday and day 7 is the following saturday. use the data from the table to create a scatter plot.

What is the difference between the points (4, 7) and (4, -5)? a. 0 units b. 2 units c. 4 units d. 12 units

Ineed to know the answer to this algebra question.