It would be c (I explained it better on the comment of the other question you asked) 1 st: You add the amount they BOTH earn for each car because you want to find want they both earn in total 2 nd: You add the tips together 3 rd: The equation would be 8,6+13 2 nd question: Plug 2 for t (2,5 (2)+2)+(1,8 (2)+3)=13,613,6/2=6,8 So for each person it would be $6,80