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Old 10-25-2009   #1
lhorilyn
 
Join Date: Oct 2009
Posts: 1
Question optimization problems! pls help me! answer needed ASAP.

If the x-intercept of the tangent to the cutve y=e^-x is increasing at a rate of 4 units per second; find the rate of change of the y intercept when the x intercept is 6.
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