title: Cannot invoke sqrt(double) on the primitive type double
body: <p>for some reason my code wont run i get the error "cannot invoke sqrt(double) on the primitive type double" thats the only error i get when i compile it so everything else doesn't cause an error except the Math.sqrt(math) line. Help?</p>
  
  <pre><code>public class Confused {
  
  public static double average(int x, int y) {
  double ave= (x+y)/2.0;
  return ave;
  }
  public static double slope(int x1, int x2, int y1, int y2){
  double slope= (y2-y1)/(x2-x1);
  return slope; }
  
  public static int difference(int x, int y) {
  int diff=x-y;
  return diff; }
  
  public static int square(int x) {
  int power1=(int)Math.pow(x, 2);
  return power1;
  
  }
   public static double distance (int x1, int x2, int y1, int y2) {
  double Math= (square(difference(x2,x1))) + (square(difference(y2,y1)));
   double dist= Math.sqrt(Math);
  return dist;
  
  }
  
  public static void main(String[] args) { 
    System.out.println(average(2,3));
    System.out.println(slope(1,2,3,4));
    System.out.println(difference(10,5));
    System.out.println(square(10));
    System.out.println(distance(2,3,6,8));
  
  }
  
  }
  </code></pre>