What is the solution to the equation? n = 2 n = 4 n = 7 n = 14

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?

Find the domain of the following expression: 1/(√x)-2

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?