How do you get an 84 on a 25 question quiz using negative numbers?

Answer 1

There are loads of ways:

If the scores for a correct and wrong answers are (108, -1) and you get 1 correct;

If the scores for a correct and wrong answers are (132, -2) and you get 1 correct;

If the scores for a correct and wrong answers are (156, -3) and you get 1 correct;

and so on, OR

If the scores for a correct and wrong answers are (65, -2) and you get 2 correct;If the scores for a correct and wrong answers are (88, -4) and you get 2 correct;

and so on, OR

skipping a whole lot of intermediate possibilities,

If the scores for a correct and wrong answers are (4, -12) and you get 24 correct.