Can someone send me the full steps so i can learn from it, i missed the lecture today so i didn't get the step by step walk through of the solution i'm having such a hard time with the optimization unit it's really tough... and our textbooks only give us to answer so i have no idea how to solve the question.

it's #6

http://smcewen.pbworks.com/f/Sec3_3+Extra+Practice.pdf