Juan starts a new coffee shop. The table shows the coffee sales at his shop for the first 5 days. What is the average rate of change in the sales per day between the 2nd and 5th day? Day 1 $160 Day 2 $200 Day 3 $230 Day 4 $270 Day 5 $330

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

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?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.