My Notes O Ask Your Teacher 5. O - points HPreCalc5 3.6.003 According to the Enc

Question

My Notes O Ask Your Teacher 5. O - points HPreCalc5 3.6.003 According to the Encyclopedia Britannica almanac, these are the estimated number of cel phone users in the United States, from 1993 to 2004. Year 1993 1994 | 1995 1996 1997 1998 Millions of . subscribers 15.806 23.967 34.709 45.926 53.712 67,619 Year 1999 2000 2001 2002 2003 2004 Millions of 87.0 06108.125 126.244 146.126 151.525 86 .731 Let Rt) 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) 1995-1998 Average rate of change (b) 1999 2000 Average rate of change users/year. Need Help? Talk to Tuter Additional Materials eBook

Explanation / Answer

a) average rate of change from 1995 - 1998

( 67.619 - 34.709 ) / 1998 - 1995

= 10970000 users / year

b) avearge rate of change from 2000 - 1999

= ( 108.125 - 87.006) / 2000 - 1999

= 21119000 users / year

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