Help on this please !! trig ratios

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x, y) ?

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=

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)