The scatter plot shows the number of dvds aaron sold in different months: what is the approximate predicted number of dvds aaron will sell in the 13th month? 380 390 400 420

We'll say that months = n. 

Make a set of the DVD's sold:



In month 1, Aaron sold 20 DVDs. There is no data for month 0.

There is a constant increase of 30 DVDs every month. We can make an equation out of this to fit this data set:



a represents the DVDs made.

We need to subtract 10 in this equation, as the starting point is 20, and the increase of 30 is different from the increase from n = 0 to n = 1.

We are looking for the amount of DVDs Aaron sold on the 13th month. Plug 13 into the equation:




The predicted number of DVDs Aaron will sell on the 13th month is 380.