Ineed assurance can't get this wrong because there are only 2 questions

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.)

Haley buys 9 pounds of apples for $3. how many pounds of apples can she buy for $1?

What is always true when two whole numbers are subtracted?