The rate of change of the oxygen level (in mmol/l) per month in a body of water after an oil spill is given by

where t is the number of months after the spill. What function gives the oxygen level P at any time t if P = 400 mmol/l when t = 0?

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5 P'(t) = 400 (t + 5)? 50 (t+ 5).