Here you go! Hopefully it was correct as i used an app called Cymath.Please mark me as Brainliest!
Nothing crazy here, just a matter of figuring out the limits of integration.



The answer is 15 - 5 x
Multiply 5 by 3 ( 15 )
Multiply 5 by -x ( -5x )
I hope this helps and please mark brainliest!
The answer is 2.5 just set it up and cross multiply then divide