1: The amount of a particular pesticide in soil decreases by 1.15% per day after application. A homeowner applies 68 grams of the pesticide to a square yard section of lawn.

Make an explicit exponential equation to model the change in quantity of pesticide present in the soil over time.

P_n = ___________

2: In 1980, the median age of the U.S. population was 30.0; in 2000, the median age was 35.3. Consider 1980 as the starting point (time zero) for this problem.

Make an explicit formula for the median age of the U.S. population t years after 1980, assuming the median age has exponential growth

A_n = ________________