12.Find the rate of change for each function.

Function A

Mandy's monthly cell

phone bill is represented

by the function

y=0.10x + 70, where x

represents the minutes

and y represents the cost.

Function B

Angel's monthly cell

phone bill is

represented by the

function y=0.25x + 30,

where x represents the

minutes and y

represents the cost.

4. How much more expensive is

Function C than Function D if they

talk for 200 minutes each?

(co 3) the soup produced by a company has a salt level that is normally distributed with a mean of 5.4 grams and a standard deviation of 0.3 grams. the company takes readings of every 10th bar off the production line. the reading points are 5.8, 5.9, 4.9, 6.5, 5.0, 4.9, 6.2, 5.1, 5.7, 6.1. is the process in control or out of control and why? it is out of control as two of these data points are more than 2 standard deviations from the mean it is in control as the data points more than 2 standard deviations from the mean are far apart it is out of control as one of these data points is more than 3 standard deviations from the mean it is in control as the values jump above and below the mean