There were 15 students on the school bus before brad's stop. twelve students, including brad, got on the bus at his stop. the bus went to a high school and 6 students got off and 3 more got on. then the bus went to the middle school where all the remaining students got off. how many students got off at the middle school?

Need to finish my juan wants to build a greenhouse in his back yard. he needs to maximize the ratio of floor area to structure volume in order to provide the most room for plants while minimizing the area to be heated. find the description of the structure that best meets juan’s criteria. a.) a hemisphere with a diameter of 12 feet b.) a cube with a side length of 12 feet c.) a cone with a diameter of 12 feet and a height of 10 feet d.) a square pyramid with a base side length of 12 feet and a height of 9 feet