Which function is a quadratic function

43lbs of tomatos cost $387. how much would 41lbs cost

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?