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?

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)

okay..i will pick 8!

22

step-by-step explanation:

22

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this