a. Define the variables and state which is dependent and which is independent.

b. State whether the relationship is linear or exponential.

c. Write the appropriate equation.

d. Answer any questions.

The following table gives the percentage of new plant and equipment expenditures by US manufacturing

companies on pollution control.

t = time in years since 1975

P = % of new plant and equipment expenditures spent on pollution control

t 0 5 6 9 12

P 9.3 4.8 4.3 3.3 4.3

According to an exponential model, determine the percentage of new plant and equipment

expenditures by US manufacturing companies on pollution control in 1990. How accurate do you

believe this prediction to be? Justify your answer.