A school purchases boxes of candy bars. Each box contains 23 candy bars. Each box costs $10. How much does the school have to charge for each candy bar to make a profit of $70 per box? Write an equation where crepresents the cost of a candy bar and solve.

(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.