3. Point Q(1, 2) is the midpoint of the line segment ST. Find the coordinates of points S and T if T lies on the x-axis and S lies on the y-axis. [4]

(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.