Someone tell me the answer and how you got it : (

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

The sum of two numbers is 12 and their difference is 18 what are the two numbers

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