The temperature in Des Moines decreased by 4 Fahrenheit every 2 hours for 6 hours. Which expression represents the change in temperature? A(4)(-2)
b(-4)(-3)
c(-4)(2)
D(-4)(3)

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.)

Ten times the square of a non-zero number is eqaul to ninety times the number

Which will form a composite function?