evaluate the integral using FTC

∫10 (e^(-9x)) / (e^(-9x) + 6)) dx

8

Evaluate the integral using the fundamental theorem of calculus.

I don't know how to do rational numbers, i know that it is complex

because of the quotient rule for derivatives

anyway, here's mywork so far

**∫from 10 to 8 (e^(-9x))/(e^(-9x)) + ** **∫from 10 to 8 (e^(-9x))/6**

**∫from 10-8 (1) + ****∫from 10 to 8 (e^(-9x))/6**

**2 + 1/6 ****∫from 10 to 8 (e^(-9x))**

**2 + 1/6 [(****(e^(-90+1))/(-90+1)) - ((****e^(-72+1))/(-72+1))]**

**2 + 1/6 [(****e^(-89)/(-89)) - (****e^(-71)/(-71))]**

**this is wrong, **

**please help :(**

**thanks, **

**brittany**