The city zoo collected $100 in one morning. an adult ticket is $5 each, and a child's ticket is $3. how many different combinations of adult and children's tickets would have totaled $100?

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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.)

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