Concrete is a mixture of cement, sand, and gravel. the masons will purchase a cement, sand, and gravel mixture in a ratio of 1: 2: 3. how many pounds of each material are needed for 60 lb of concrete mix?

(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.