PLZ IM ON A TEST AND HAVE 2 MIN LEFT Which equation does NOT represent a direct variation?
1.-3x+2y=0
2.-2y=x
3.y=50x
4. 5x+2y=10

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.)

Ben is three times as old as samantha, who is two years older than half of michel's age. if michel is 12. how old is ben?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?