Model the unknown number problem by writing an algebraic expression. Then complete the statements. The class was divided into three equal groups. The number of students in class is represented by . The words “divided into three equal groups” means division by 3 . The correct algebraic expression is .

Brittany has designed four different birdcages, each with the same volume: a square pyramid, a cylinder, a cone, and a sphere. the zoo wants to use one of brittany’s designs but plans to change the volume of the cage. find the design change that would result in the birdcage with the greatest volume. a.) increase the area of the base of the square pyramid by a factor of ten. b.) increase the height of the cylinder by a factor of ten. c.) increase the radius of the cone by a factor of ten. d.) increase the radius of a sphere by a factor of ten.