exam Maths Puzzle Numerical Ability

If the average (arithmetic mean) of x and y is k, which of the following is the average of x, y, and z?

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I am horrible at math and need some tutoring. My question is, How do you the numbers that need to be excluded from the domain? Not necassary wanting the answer just want it explai Graph the linear equation using the slope and y-intercept: y=-4x+6