What are the 4 ways that you can find the roots/zeros/x-intercepts of a quadratic function?

Ateacher has $80 to buy workbooks. each work book cost $3. if she buys as many workbooks as possible, how much money does she have leftover? a) $2 b) $4 c) $6 d) $8

How do you use the elimination method for this question? explain, because i really want to understand!

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression