To get the answer, you need to think of it like a see-saw.
Both sides must equal the same relative to 33.5. For example, 32 is 1.5 away from 33.5 so you could say you have 1.5*4 (because theres 4 tubes with 32 sweets). If you were to do this for the whole table, it would look something like this:

This simplifies to:




This method can sometimes be inefficient depending on how many values but is probably the simplest way to solve this problem.
hope this helps :)
(sorry the other way is kinda hard to explain possibly ask your teacher tomorrow)
The answer is 9
both 81 and 63 are dividable by 9, and nothing higher
The slope =0. Horizontal lines have a slope of 0
The answer is x bc when you decreasing the interval f(x) it will equal (-2)
43.5 because if it were anything below that it would've been rounded down to 43 instead of up to 44.