Question

The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is...

The rate (in mg carbon/m3/h) at which photosynthesis takes place for a species of phytoplankton is modeled by the function

P =

120I
I2 + I + 1

where I is the light intensity (measured in thousands of foot-candles). For what light intensity is P a maximum?
I =  thousand foot-candles

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