Find the volume of the solid

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

If you could answer these your a life saver

(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.