Find angle S among the measures

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

What’s the domain of this function? fast

Can someone pls ! pls answer all. no explanation needed..