Kristi is selling candy bars to raise money for her track team. Each of her neighbors bought 4 candy bars. she also sold 18 candy bars to her friends at school for a total of 38 candy. The equation 4x + 18 = 38 represents this situation where x is the numbers of neighbors. How many neighbors bought candy bars from Kristi?

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.