When a substance degrades exponentially over time, the amount of time required for half of the substance to remain is called the half-life of the substance. The half-life of a pesticide is 10 years. A farmer initially applies 200 grams of the pesticide to a fence post. Complete the following statements. After 20 years, there are the nearest whole gram. After 60 years, there are the nearest hundredth of a gram. After grams of pesticide left. Round your answer to grams of pesticide left. Round your answer to years, there are approximately 1.03 grams of pesticide left. Round your answer to the nearest whole year.

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