According to the Encyclopedia Britannica almanac, these are the estimated number of cell phone users in the United States, from 1993 to 2004.
Year 1993 1994 1995 1996 1997 1998
Millions of
subscribers 17.541 24.676 35.463 41.848 56.311 61.786

Year 1999 2000 2001 2002 2003 2004
Millions of
subscribers 85.413 107.17 125.812 147.113 159.25 185.438
Let f(t) be the number of cell phone users in year t. Find the average rate of change in cell-phone use during the following time periods. (Round each answer to the nearest thousand.)
(a) 1994 - 1996
(b) 1999 - 2001

Question

According to the Encyclopedia Britannica almanac, these are the estimated number of cell phone users in the United States, from 1993 to 2004.
Year	1993	 1994	 1995	 1996	 1997	 1998
Millions of 
subscribers	17.541	24.676	35.463	41.848	56.311	61.786

Year	1999	 2000	 2001	 2002	 2003	 2004
Millions of 
subscribers	85.413	107.17	125.812	147.113	159.25	185.438
Let f(t) be the number of cell phone users in year t. Find the average rate of change in cell-phone use during the following time periods. (Round each answer to the nearest thousand.)
(a) 1994 - 1996 
(b) 1999 - 2001

anonymous · Answer

Match the years with the numbers in that order (first year goes with first number below).
Sorry, if that confuses anyone. I just copied and pasted because it would have taken forever to type this out.

anonymous · Answer

This is what i got: 8.586 but its wrong

anonymous · Answer

yes we can do this. it is the same as finding the slope of a line

anonymous · Answer

from 1994 to 1996 is 2 years.

anonymous · Answer

yes it is lol

anonymous · Answer

$$41.848-24.676=17.172$$ so your answer is 
$$\frac{17.172}{2}=8.586$$

anonymous · Answer

same i idea for the next one

anonymous · Answer

can u help with the second too? im getting 20.1995 or 20,199,500 (thats correct, right?)... but its wrong.

anonymous · Answer

nevermind! i got it! thanks again