Half the students in max's class volunteer at the local community center. 15 students do not volunteer. if there are 12 boys in max's class , how many girls are in max's class? i am having a brain freeze!

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.)

At your job you're paid $50 per week plus $3 per sale at least how many saled do you need to make in order to have over $250

Measure a and b and find their sum. how are the angles related?