1. A 100-inch strip of metal 16 inches wide is to be made into a small open trough by bending up two sides on the long side, at right angles to the base. The sides will be the same height, x. If the trough is to have a maximum volume, how many inches should be turned up on each side?
2. The radius of a 12 inch right circular cylinder is measured to be 4 inches, but with a possible error of ±0.2 inch. Use linear approximation or differentials to determine the possible error in the volume of the cylinder. Include units in your answer.