Lydia rides her bike3 miles from her house to the store. then sheer bike 7 miles from the store to her friends house. then she rides her bike home. she doesn't know how far it is from het friends house to her own house but she knows that she biked 15 miles in all. how far is it from lydias friends house to her own house

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