The ratio of the amount of money in David's pocket to that in Indira's pocket is 10 : 9. Indira has 27p How much does David have?

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

Joe has a rectangular chicken coop. the length of the coop is 4 feet less than twice the width. the area of the chicken coop is 510 square feet. what is the length of the chicken coup?

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.