Ecology (Lotka-Volterra) HW

Very brief ecology HW assignment I need help with. It is only 3 problems, but I am offering $20, because of the short notice -- I need it back and completed within about 4.5 hours of my posting this (by 1am Mountain Time). 

I will not respond to offers from those that do not have good ratings, those that do not have backgrounds in biology/ecology, or those that do not personally specify their comfort in completing this homework specifically. 

If you are 100% comfortable with the material, and you are able to complete it with ALL work shown AND brief explanations of how you arrived at the answers, please contact me ASAP. Again, I don't anticipate it will take long, I just simply don't have time right now, and I need to get this done.