If 400 bricks measuring 81" by 31" are required to build a wall 42 ft. high, how long is the wall​

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

A50% increase followed by 33 1/2% decrease

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.