The intensity I of sunlight at the surface of a lake is 300 watts per square meter.

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The intensity I of sunlight at the surface of a lake is 300 watts per square meter. For each 1-foot increase in depth of a lake, the intensity of sunlight decreases by a factor of 9/10.

(a) Estimate the intensity I of sunlight at a depth of 50 feet. 

(b) Graph the intensity of sunlight to a depth of 50 feet. Interpret the y-intercept.

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