JUST HELP ME PLS THANKS

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

Solve the system of equations y= 3/2 - 1, -x+ y =-3

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?