Simplify the following expressions

Which point lies on a circle with a radius of 5 units and center at p(6, 1)?

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?

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?