Answer:
A and C
Step-by-step explanation:
A function has a unique y value for every unique x value
The vertical section disqualifies B
D has 2 y values for many x values.
How many pages did Ben read?
Ben read 18 pages
How many fewer pages did Amy compose than Ben?
18 - 12 = 6
How many pages did Amy and Ben read in all?
18 + 12 = 30
A
idk sorry