Identical factor of a number

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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 length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i