SOLUTION: In the year 1995, there were 25 million cell phone users. In the year 2005, there were 175 million cell phone users. If the growth in the number of cell phone users is linear, esti

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: In the year 1995, there were 25 million cell phone users. In the year 2005, there were 175 million cell phone users. If the growth in the number of cell phone users is linear, esti      Log On


   

Question 619816: In the year 1995, there were 25 million cell phone users. In the year 2005, there were 175 million cell phone users. If the growth in the number of cell phone users is linear, estimate the number of cell phone users in the year 2015. Let t=0 correspond to 1995.
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Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,

In the year 1995, there were 25 million cell phone users. In the year 2005, there were 175 million cell phone users.

(10, 175)   2005:  t = 10 (10 years from 1995)

(0,  25 ) m = 150/10 = 15

f(t) = 15t + 25  (t=0 correspond to 1995)

estimate the number of cell phone users in the year 2015.

f(20) = 15·20 + 25 = 325 milion