please help on physics homework???

Posted on 2015-09-04 07:25:00 in Physics by SAMANTHA

Environmental scientists measure the intensity of light at various depths in a lake to find the "transparency" of the water. Certain levels of transparency are required for the biodiversity of the submerged macrophyte population. In a certain lake the intensity of light at depth x is given by
I = 10e?0.007x
where I is measured in lumens and x in feet.
(a) Find the intensity I at a depth of 30 ft. (Round your answer to two decimal places.)
(b) At what depth has the light intensity dropped to I = 5? (Round your answer to one decimal place.)

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