3. For each of the following, identify whether the demand is elastic, inelastic, or unit elastic:
a. The price of apples rises 10 percent as the
quantity demanded falls 20 percent.
b. The price of cars falls 5 percent as the
quantity demanded rises 10 percent.

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.