1) http://www.geocities.com/asdfasdf23135/advcal23.JPG For this question, we have to use the surface integral to compute the area, but I just can't picture what is going on geometrically, so I am stuck at the very begining...can someone please help me? 2) http://www.geocities.com/asdfasdf23135/advcal24.JPG I don't quite get the setup for this question as well. Firstly, we are given that z=y2-2x, -2<y<2, 0<z<4, but what does it mean geometrically? I can't understand this part... Secondly, what does it mean for the normal to point away from the z-axis? Does it even define a unique direction? Any general hints or explanation will be greatly appreciated!