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DDT is an insecticide that has been used by farmers. It decays slowly and it is sometimes absorbed by plants that animals and humans eat. DDT absorbed in the mud at the bottom of a lake is degraded into harmless products by bacterial action. Experimental data shows that 10% of the initial amount is eliminated in 5 years(so what would remain?) a) Find the value of k in the decay formula: y= ae kt (Pet with different letters) b) How much of the original amount of DDT is left after 10 years?

DDT is an insecticide that has been used by farmers. It decays slowly and it is sometimes absorbed by plants that animals and humans eat. DDT absorbed in the mud at the bottom of a lake is degraded into harmless products by bacterial action. Experimental data shows that 10% of the initial amount is eliminated in 5 years(so what would remain?) a) Find the value of k in the decay formula: y= ae kt (Pet with different letters) b) How much of the original amount of DDT is left after 10 years?

Algebra and Trigonometry (MindTap Course List)
Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter4: Exponential And Logarithmic Functions
Section4.CR: Chapter Review
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ASAP PLEASE DO PARTS A B AND C
2. ECOLOGY DDT is an insecticide that has been used by farmers. It decays slowly and it is sometimes absorbed by plants that animals and humans eat. DDT absorbed in the mud at the bottom of a lake is degraded into harmless products by bacterial action. Experimental data shows that 10% of the initial amount is eliminated in 5 years(so what would remain?) a) Find the value of k in the decay formula: y = aekt (Pet with different letters) b) How much of the original amount of DDT is left after 10 years? c) The U.S. Environmental Protection Agency banned almost all use of DDT in the U.S. in 1972. If none has been used near the lake since then, in what year will the concentration of DDT fall below 25%?
Transcribed Image Text:2. ECOLOGY DDT is an insecticide that has been used by farmers. It decays slowly and it is sometimes absorbed by plants that animals and humans eat. DDT absorbed in the mud at the bottom of a lake is degraded into harmless products by bacterial action. Experimental data shows that 10% of the initial amount is eliminated in 5 years(so what would remain?) a) Find the value of k in the decay formula: y = aekt (Pet with different letters) b) How much of the original amount of DDT is left after 10 years? c) The U.S. Environmental Protection Agency banned almost all use of DDT in the U.S. in 1972. If none has been used near the lake since then, in what year will the concentration of DDT fall below 25%?
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