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The exponential function 

P = 500 × 0.88m

 gives the amount in parts per million of PCBs in a contaminated site m months after a cleanup process begins.

(a) What is the weekly decay factor? Assume there are four weeks in each month. (Round your answer to two decimal places.)

 

(b)Find a formula that gives the amount P in parts per million w weeks after cleanup begins.

P = 500 × 0.97w

P = 500 × 0.94w     

P = 500 × 3.52w

P = 500 × 0.60w

P = 500 × 0.22w

 

 (c)What is the yearly decay factor? (Round your answer to two decimal places.)

 

(d)Find a formula that gives the amount P in parts per million y years after cleanup begins.

P = 500 × 0.99y

P = 500 × 0.07y

P = 500 × 10.56y

P = 500 × 0.22y

P = 500 × 5.28y

 
 Mar 28, 2020

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