Read carefully — this is an easy 2 point giveaway:
The total number of tickets is 150 and a is how many adult tickets and c is how many child tickets.  The adult ticket is $10.25 and the child ticket is $7.75 so this has to go with the $$.

The x values are the same in all 4 answer choices.  We need to focus on the y-values!
One of the best definitions of a linear function is “every time x changes by 1, y changes by the same amount”.  We can determine this by looking at the differences in the y values or f(x), g(x), h(x) or k(x)
(1) f(x): each time the x value goes up by 1 the y value goes up by how much?
(2) g(x) is each change the same?  (from -1 to 1 is a difference of 2 but from 1 to 5 is a difference of 4)
(3) h(x) is each change the same?  from 9 to 12, it changes by 3 but then from 12 to 17, it changes by 5
(4) k(x), is each change the same?  from -2 to 4, the change is 6, but from 4 to 14 the change is 10

That’s it — you just found the linear function!! 2 points!

As more popcorn is sold, what is happening to soda sales?
Another question to think about, if you were to draw a line of best fit would the slope be negative or positive?
Read carefully and think thoughtfully about correlation vs causation..

Since all of the intervals are two years, we just need to find the smallest change:
For answer (1), it changed 12 (from 11 to 23)
Answer (2),  17 (from 16 to 33)
Answer (3), 19 (from 23 to 42)
Answer (4), 14 (from 33 to 47)

That’s it — 2 points!!

This question is categorization and is easy to figure out with some close reading:
A fifth degree expression has a highest power of 5 so that takes out answers (2) and (3) leaving (1) and (4).
A leading coefficient of 7 is exactly what it sounds like — does answer choice (1) or (4) have a first term that starts with a 7?
A constant of 6 is 6 without any algebra or variables so find that to confirm your answer! :)