1x1=? I have no clue and im 13

The table represents a function f(x). what is f(3)? a.-9 b.-1 c.1 d.9

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {