What is the ratio 15: 75written as a fraction in lowest terms?

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?

How do you find the circumfrance of a circle?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?