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Hello! I need help with the following question: 35mL of 0.86 M sulfuric acid was placed into a 25mL solution of 1.00 M sodium hydroxide. b) Calculate the concentration hydrogen or hydrogen ions after this reaction. You may assume the reaction is complete. (3 marks) c) Calculate the pH...

A cylindrical can is required to be able to hold 20pi m^3. The can is to be made out of aluminium for the top and bottom at $10/ m^2, and copper is to be used for the side at $8/ m^2. Find the height and radius of the can that minimises the cost, and find this cost.

I ended using the product rule and I got theta = -1. I tested it with the first derivative test and it came up as a minimum point :| Where did I go wrong, aha.

Can someone help me with q. b) here http://imgur.com/wOCOQFF Steps appreciated, thanks!

This is from the 1998 NEAP 2U Trial: Consider the function f(x) = ax^3 + bx^2 +cx + d, where a, b, c and d are constants. The graph of y = f(x) has a minimum turning point, P, at x = 0; a point of inflexion, Q, at (1,1); and a maximum turning point, R, at (2,3). a) Find f'(x) and show...