explain how to use the table to determine the rate of change

Question

customers:20 30  40

CD's sold: 24  36 48

Answer 1

The rate of change is the amount of CD's sold per customer.  This is also the slope in algebraic means.

 

The slope is the change in y over the change in x.

 

Slope = CDs sold / customers

 

 

The common difference in CDs sold is 12.  The common difference in customers is 10.

 

Slope = 12 / 10 = 1.2

 

 

The rate of change is 1.2

 

 

That is about 1 CD sold per customer.