Add all the A tasks

Task/Arithmetic-geometric-mean/Java/arithmetic-geometric-mean.java

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+/*
+
+        Arithmetic-Geometric Mean of 1 & 1/sqrt(2)
+
+        Brendan Shaklovitz
+        5/29/12
+
+*/
+
+public class ArithmeticMean {
+        public static void agm (double a, double g){
+                double a1 = a;
+                double g1 = g;
+                while (Math.abs(a1-g1) >= Math.pow(10, -14)){
+                        double aTemp = (a1+g1)/2.0;
+                        g1 = Math.sqrt(a1*g1);
+                        a1 = aTemp;
+                }
+                System.out.println(a1);
+        }
+
+        public static void main(String[] args){
+                agm(1,1/Math.sqrt(2));
+        }
+}