The relationship between the number of months and cumulative cell phone cost is represented by the scatter plot shown. Cumulative Cost
600
500
400-
Cumulative Cell Phone Cost (dollars)
(10, 504)
(9,470)
(8,418).
•(7, 361)
(6, 324)
•(5, 253)
(3, 162) •(4, 196)
300
200
100+(1,55) (2, 108)
0
9
10
8
Number of Months
A line of best fit for this data is C = 51m +4.4, where is the cumulative cell phone cost and m is the number of months.
Using this data, which value is the best prediction of the cumulative cell phone cost after 18 months?