Please answer the question in the attached file.

Requirements:

1. Read the question carefully.

2. Use grade 12 calculus level answers.

3. Answer in exact integers, fractions, multiples of ?, or radicals.

4. Include step-by-step instructions and detailed answers in chronological order.

5. Maintain proper answer formatting.

2. A dangerous toxic pollutant has been accidentally spilled in a lake. 1 The speed of water contamination is modelled by Pu) = 84 where P is the concentration in mg per m3 and t is time in minutes. 40 minutes later, the Environment Protection Agency has released in the lake another chemical that neutralizes the toxic pollutant. The concentration of the t 2 second chemical is modelled by N\") = 3 . The toxic pollutant will be completely neutralized when the two concentrations are equal. a) When is the maximum concentration of pollution reached? b) When is the toxic pollutant completely neutralized