The ratio of hard problems to easy problems was 23 to 7.How manny easy problems were there if the total number of problems was 930?

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.)

This is about circle theorems. someone asap : (

If a is a nonzero real number then the reciprocal of a is