Need help asap 50 doller reward....

[calais25t]

Hey guys new to the Forum, I need help asap. I will deposit 50 bucks into anyones account that can show the working for these 2 questions in integration format. Sorry if its in the wrong section but I need this asap please.

[cheerio]

4 Years since i did this stuff the last time and i was horrible at it :) so take it with caution it might be totally wrong!

7)
http://www.wolframalpha.com/input/?i=integrate%28t%3D0+to+500%29+%2880%2F4000%29+*+e^%28-t%2F%280.5*4000%29%29
8)
http://www.wolframalpha.com/input/?i=integrate%28t%3D0+to+200%29+%28200%2F50%29+*+%281-e^%28%28-t*50%29%2F10000%29%29


I basically just did what the paper says :) only mess-up is with the unit. Never got what unit factor to use hehe