the perimeter of a rectangular pool is 60 meters. if the lenght of one side of the pool is 25 meters then find the width of both sides of the pool

We just started the introduction into circles and i have no idea how to do this.

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!