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Task 3

Adding the buttons while assuring the layout stays fine is very simple. Just go to the tree view, select a button and use copy (command c) and paste (command v).

Task 8

Different options are possible. You can have a function in CalculatorBrain that resets all internal variables. Other option is just to initiate a new model. For this last option, you should verify that the old model is not referenced at all in order to avoid memory leaks.