Please answer all parts asap

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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

If eh = hg and hg=16, find the diameter of k