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3 Unit A2 1: Pure Mathematics (A-level only)

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Question 274

An environmental study models the concentration of a pollutant, PPP, in a stream as P=ln⁡(0.8t)P = \ln(0.8t)P=ln(0.8t), where t>0t > 0t>0 is the time in hours after a treatment process begins. Determine the exact value of the rate of change of the concentration with respect to time at the instant when t=2.5t = 2.5t=2.5.

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3 Unit A2 1: Pure Mathematics (A-level only) Questions

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