What is the circumference of a circle with radius 2.1cm? Use a = 3.14. A. 12.69 cm
B. 8.724 cm
C. 13.188 cm
D. 6.594 cm

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.)

Can someone me out here number 4 plz

Which of the functions below could have created this graph?