Please solve the answer for me.
Just need an explanation for this.
Note:
1. No copied answer
2. Spammers stay away.
3. It is from my book not a test so need perfect explanation for this equation.
Thank you!

Which of the following are accepted without proof in a logical system? check all that apply.

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

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=