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The answer depends on the context. Some examples:

  • z can represent the length of a side of a polygon, for example, a triangle with sides of lengths x, y and z;
  • z can represent the vertical axis in 3-dimensional coordinate geometry (where x and y are used for the base plane);
  • z can represent a variable in the complex plane (z = x + yi);
  • z can represent the probability that a random observation from a Normal distribution is at least as extreme as the one seen.
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8y ago

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