Help for brainlest ​

What is the length of the unknown leg in the right triangle ?

Which basic geometric term has no width, no length, and no thickness? line b. point c. angle d. plane

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?