PLEASERE

Combined megan and kelly worked 60 hours.kelly worked twice as many hours as megan.how many hours did they each worked?

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.)

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2