exam Maths Puzzle Numerical Ability

Let n represent an even integer. Wright an expression for the following question.
What is the next even integer?

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Hi I need to simplify the following could you please help me. thank you so much, I appreciate your assistance.

6. Simplify: 8 � {3x + 9y � (2x � y) + 8x + 5y} I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4