Can someone help I need help lol

Which of the following is not a subset of {1,2,3}?

An internet company charges $8.95 per month for the first 3 months that it hosts your web site. then the company charges $11.95 per month for web hosting. how much money, in dollars, will the company charge for 8 months of web hosting?

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me