A shop sells pens and files only in packs. A pack of 3 pens cost $12. A pack of 2 files cost $10. A student wants to buy an equal number of pens and files. What is the least amount that the student must pay?

(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.