Atest has 20 questions how many do you need to answer correctly in order to get 4/5 of them right

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

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=

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)