Depending on who is selling them lol
I think the employer because basically u have to buy them from the employee so that is my opinion.
2x+1.5x+9 would be the equation to use here
Both in aerobics and dancing there is a lot of excercise going on...like salsa dancing, ballet, and break dancing...you use a lot of muscles jumping, twirling, and repetitions.
Head I hope I helped you usually the head comes first unless it's the other way around then the AWNSER would be legs
The renal vein and the bowmans space