Find the exact value of tan^-1 (-root 3/3)answer in radians in terms of π

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

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?

Mikael, hema and 5 friends will run an event. they will wear either a red shirt or red baseball hat during the event. they want to spend exactley $40. shirts cost $8 each and caps cost $4 each.