Which of the following sets is not finite?

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?

What are the domain and range of the function f(x)=2^x+1

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)