The Smiths use natural gas to heat their home. Last year paid $14.50 per thousand cubic feet (Mcf). The price increased 20% this year so they are now paying $17.4 per Mcf.

(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.