book Maths Puzzle Numerical Ability

How do you combine like terms like this? -5x+8+7x-11

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Please do you have a simple formula for finding the centre of a 2 dimensinal circle if I know 3 points on this circle? In one of the early rocket experiments on The Planet of the Apes, a banana was launched straight upward so that its height in feet above the ground after t seconds was given by the function h= -42t^2+504t. When did the banana hit the ground?