ITS MORE THAN ONE QUESTION PLEASE HELP 50 POINTS ITS URGENT

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 t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=

Can someone show me step by step how to do this?

Through which points should a line of rotation be placed to create a cylinder with a radius of 3 units