Please tell fast plz​

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

Complete the statements about the system of linear equation respresented by the tables the equation respented the left table is

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.