Is 5/7 irrational number

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

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

Is the figure congruent? yes or no?