what exactly don't you understand?, if you know the definition of partial derivative and the derivative of the e^x function there's no reason for a problem.
1. what would be the derivative of : xe^[y-(z^2)]
when Z is the variable?
2. use differentials to estimate the amount of metal in a closed cylindrical can that is 10cm high and 4 cm in the diametre if the metal in the top and bottom is 0.1 cm thick and the metal in the sides is 0.05 cm thick.
how do i do this??