In a quadratic function you square x so I'd assume that's what they want.
That means the values of f(x) would be:
9
1
1
9
25
The best math that i think you should take would be calculus.
The remainder for 67 divided by 3 would be 1 because (this might be a bad explanation since i'm not good at explaining math without showing u my work) if u do divide 6 by 3, 3x2 is 6 and 6-6 is 0. Then if u divide 7 by 3, then 6 is the closest u can get to 7 without multiplying by a decimal. Then if u do 7-6, u get 1 and u cant divide 1 by 3 so the remainder would be 1.
To figure out who is taller, we can take each mixed number and find a common denominator.
5/16 (x3) 15/48
7/24 (x2) 14/48
This tells us that Ben is taller because Marcus is shorter than him by 1/48.