Problema Solution
in 1980, there were 119,000 farms in iowa. as of 2008, there were 93,000. find and interpret the average rate of change in the number of farms per year, to the nearest whole number.
Answer provided by our tutors
An average rate a change function is a process that calculates the the amount of change in one item divided by the corresponding amount of change in another.
in our case the first item is farms and the second in years thus
the average rate of change A = the change in the number of farms / the time span in years
A = (119,000 - 93,000) / (2008 - 1980)
A = 26,000 / 28
A = 928.57 farms per year
A = 929 farms/year to the nearest whole number
This means that in the period of 1980 till 2008 the average number of farms was decreasing by 929 per year.