Explain the steps to find the difference of the question below

100 points, hi, i’m not sure how to get the equation from the graph and table.

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?