Plz i need to graduate 15 pls! which of the following relations is a function? a. {(2, 2), (3, 3), (4, 4), (5, 5)} b. {(2, 1), (2, 3), (3, 6), (3, 7)} c. {(3, 5), (4, 9), (4, 11), (5, 14)} d. {(4, 8), (6, 6), (8, 4), (8, 2)}

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.