Problema Solution
The cost of a stamp was 15 cents in 1980 and is 46 cents today. Find the rate of change.
Answer provided by our tutors
rate of change = change in cost/change in years
rate of change = (46 - 15)/(2014 - 1980)
rate of change = 31/34
rate of change = 0.91176 cents per year
the rate of change is 0.91176 cents per year.