Jim washes cars to earn money. On monday he washes 12 cars and earns $84. On tuesday he washes 6 cars and earns $42. On wednesday he washes 15 cars and earns $105. What is the rate of change of Jim's earnings?

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.