Jessica bought a new computer for $800. she put $120 down and got a student discount of $50. her mother gave her 1/2 of the balance for her birthday. use the numerical expression to find the amount that jessica still owes for the computer. {800 - (120 + 50)} divided by 2

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.