Briana is 150cm tall. her friend julia is 10% taller than her. chelsea, briana's little sister, is 80% of briana's height. olivia, julia's little sister, is 21cm shorter than julia. how many cm shorter than olivia than chelsea.

Restrictions on f(x) = 1/x+5 and g(x) = x-2

Acircular garden with radius of 8 feet is surrounded by a circular path with a width of 3 feet. what is the approximate area of the path alone? use 3.14 for π

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?