An aquarium measures 61 cm long, 30.5 cm wide, and 30.5 cm high. If the tank is only filled to 80% capacity with water, how much water is needed for this tank? Round your answer to the nearest tenth. Use only numbers and decimal point in your answer

(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.