Below is the graph of a trigonometric function. It has a minimum point at \left(1,1.5\right)(1,1.5)left parenthesis, 1, comma, 1, point, 5, right parenthesis and an amplitude of 1.51.51, point, 5.

(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.