Bart has two choices to make a long distance phone call. His two choices are:10-10-220 and AT&T. Using 10-10220, the cost is 99¢ for the first twenty minutes, and 7¢ for each additional minute. AT&T just charges 6¢ for each minute. After how many total minutes will it be less expensive to use AT&T? Assume the call is at least 20 minutes.

an advantage of the standard deviation is that it increases as the dispersion of the data increases. e. the interquartile range is preferred when the data are not skewed or no have outliers. an advantage of the standard deviation is that it uses all the observations in its computation.

the answer is simply just 6n add the two together as they have an n

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is