24. The Math.pow method

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  double result = Math.pow(2, 2);
                              // result is 4.0 (2*2)
  double result = Math.pow(2, 3);
                              // result is 8.0 (2*2*2)
  double result = Math.pow(5, 2);
                              // result is 25.0 (5 squared)
  int result = (int) Math.pow(5, 2);
                              // result is 25 (5 squared)