Hi,

I cant seem to get the answers they have got... Its weird how they ask for the partial derivatives when its possible to find the complete derivative (i think lol... im probably wrong though) if you just want to find the partial derivative... how do you know which part to find?

Also, i put the numerical conditions in after finding the derivative.. is this correct or do you put them in at the beginning?

The solutions are 85, 178 and 54 respectively.

Thanks.