Homework Help: algebra

Posted by Steve on Tuesday, November 27, 2012 at 3:06am.

Light intensity(lumens) at a depth of x feet has the equation log I/12=-0.0125x

what depth will the light intensity be half that of the surface

algebra - Steve, Tuesday, November 27, 2012 at 4:35am
at x=0, I = 12
so solve
log 6/12 = -x/8
log2 = x/8
x = 8log2

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