2/3 = 18/x+5 what number does the letter x represent

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

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

What is sin 7x/4 ? i need on this urgent trig