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## Homework Statement

find the integral from 100 to infiniti for (x-100)(.002e^(-.002*x))## Homework Equations

## The Attempt at a Solution

.(xe^-(.002x))(e^(-.002x))-(-100e^(-.002x)) |from 100 to infiniti = -(100e^-.2)(e^-.2)+100e^(-.2)=14.84the answer should be 409.37. What am I missing, please?