Iwill mark you the brainliest if you answer quickly and correctly the amount of money that mary earns varies directly with the number of hours worked. if mary earns $320 for working 40 hours, determine the constant of variation. a) 6 eliminate b) 7 c) 8 d) 9

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