the seats in a theatre are arranged so there are 80 seats in the 1st row, 77 seats in the 2nd row, 74 seats third row and so on for 18 rows altogether. how many seats are there in the last row?

(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.