Could anyone please help me? your parents want to install a new carpet in their living room the carpet costs $18.81 for three square yards the living room is 10 ft long by 9 ft wide use a direct variation equation to determine how much it will cost your parents to carpet the living room

I also need to write a direct variation!

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.