Already solved them thanks...
this is one of my last two courses to finish college -mathematical economics... not a homework
i have started a full-time job and it is nearly impossible for me to attend the classes right now that is why i seek help in this site
i am sorry HallsofIvy but i guess this is one of the purposes of this site ,find help. i didn't now that i have to promise a fee for the answerers
Do i have to ???