Problema Solution
The number of visits to public libraries from 1.4 billion in 1992 to 1.5 billion in 1997. find the average rate of change in the number of piblic library visiys from 1992 to 1997.
Answer provided by our tutors
(1.5 - 1.4)(1997 - 1992) = 0.1/5 = 0.02 billions per year
1 billion = 10^9 years
0.02 billions = 0.02*10^9
0.02 billions = 2*10^7
the average rate of change of visits per year is: 2*10^7 visits per year = 20 million visits per year (10^6 = 1 million).