Question

In the year 1995, the average cost of a cellphone could be modeled by the equation C=-10t^2+1600 where t is the number of years since 1995.By the year 2009 the average cost had changed, so it could be modeled by the equation C=-18t^2+800. Find the difference in the average costs for a cellphone between 1995 and 2009.

Answer 1

Answer:

In the year 1995, the average cost of a cellphone could be modeled by the equation C=-10t^2+1600 where t is the number of years since 1995.By the year 2009 the average cost had changed, so it could be modeled by the equation C=-18t^2+800. Find the difference in the average costs for a cellphone between 1995 and 2009.