-3 is the remainder when you synthetically divide
Answer:

Step-by-step explanation:
The slope is 1/4 since y increases 1 when x increases by 4 (you divide deltaY by deltaX).
Then, to make it go through (0,-4) you subtract -4.
the first few bars are the people who walked fewer than 4,000, so add up the numbers on the side (2 and 5) and you get 7, so a
The answer is C. Hope that helps