PLEASE HELP!!!!
The photic zone describes the region in which microscopic plant life receive enough light to survive. The photic zone goes to a depth where about 1% of the surface light still remains. Find the depth of the photic zone if the intensity of light (L) at a depth (d) in meters is given by L=L0e^(-0.028d), where L0 is the intensity of surface light. You may use the graphing part of your calculator for this question.
Possible answers are:
a. 124 m
b. 134 m
c. 144 m
d. 154 m
e. 164 m

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I know you can use your calculator to find it but I have no idea how!!!

L=100 per cent
LO=1 per cent

Ok, so how can I use that to solve? :( do I plug 0.01e^(-0.028x) into my calculator???

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