What is the area, in square units, of trapezoid abdc which is formed by two triangles? a (-6,-7), b (-6,4), c (2,-7), and d (8,4).

(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.