Please help with questions 5, 6, and 7.

Need this asap if anyone can i would be very grateful. if you could show workings that would really

(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.

Which of the functions below could have created this graph?