Acell phone plan has a monthly cost that is shown in the table below. what is the correct statement regarding the average rate of change during the 40-minute time of talk?

Monthly cost of cell phone for 0 minutes is $19.95 and for 40 minutes of talk is $21.95.  

It means that average rate of change ( increase of monthly cost for each minute of talk time ) is: ARC = ( 21.95 - 19.95 ) / ( 40 - 0 ) = 2.00 / 40 = $0.05.

is only a line? i think so

a line is an defined derm because it

a)contains an infinite number of points b) can be used to create other geometric shapes c)describes something that does not have width or depth d) is a term that does not have a formal definition. a line is an undefined term because it: contains an infinite number of points.