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Logarithm help please

The intensity, I, of light passing through water can be modelled by the equation I=10^1-0.13, where x is the depth of water in metres. Most aquatic plants require a light intensity of 4.2 units for strong growth. Determine the depth of water at which most aquatic plants receive the required light.

I need help. This assignment consisting of a bunch of questions is due tomorrow.

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Joe

  1. shouldn't there be an x somewhere in the formula?

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    Steve

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