Evaluate. show the steps , in advance!

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=

Using elimination, what is -4x+2y=-12 4x+8y=-24

What is the gcf of 20c^3-5c^4+30c^6