MathUtilities.java

      * @return sum of `baseValue` and `difference`
      */
     public Integer add(int baseValue, int difference) {
-        return null;
+        int sum = baseValue + difference;
+        
+        return sum;
     }
 
     /**
      * @return sum of `baseValue` and `difference`
      */
     public Long add(long baseValue, long difference) {
-        return null;
+        
+        long sum = baseValue + difference;
+        return sum;
     }
 
     /**
      * @return sum of `baseValue` and `difference`
      */
     public Short add(short baseValue, short difference) {
-        return null;
+        int s = baseValue + difference;
+        short value = (short) s;
+        return value;
     }
 
     /**
      * @return sum of `baseValue` and `difference`
      */
     public Byte add(byte baseValue, byte difference) {
-        return null;
+        int b = baseValue + difference;
+        byte by = (byte)b;
+        return by;
     }
 
     /**
      * @return sum of `baseValue` and `difference`
      */
     public Float add(float baseValue, float difference) {
-        return null;
+        float f = baseValue + difference;
+        return f;
     }
 
     /**
      * @return sum of `baseValue` and `difference`
      */
     public Double add(double baseValue, double difference) {
-        return null;
+        double d = baseValue + difference;
+        return d;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Integer subtract(int baseValue, int difference) {
-        return null;
+        int i = baseValue - difference;
+        
+        return i;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Long subtract(long baseValue, long difference) {
-        return null;
+        long l = baseValue - difference;
+        
+        return l;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Short subtract(short baseValue, short difference) {
-        return null;
+        int s = baseValue - difference;
+        short value = (short) s;
+        return value;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Byte subtract(byte baseValue, byte difference) {
-        return null;
+        int b = baseValue - difference;
+        byte by = (byte)b;
+        return by;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Float subtract(float baseValue, float difference) {
-        return null;
+        float f = baseValue - difference;
+        
+        return f;
     }
 
     /**
      * @return difference between `baseValue` and `difference`
      */
     public Double subtract(double baseValue, double difference) {
-        return null;
+        double d = baseValue - difference;
+        return d;
     }
 
 
      * @return division of `dividend` by `divisor
      */
     public Integer divide(int dividend, int divisor) {
-        return null;
+        int div = dividend / divisor;
+        
+        return div;
     }
 
     /**
      * @return division of `dividend` by `divisor
      */
     public Long divide(long dividend, long divisor) {
-        return null;
+        long div = dividend / divisor;
+        
+        return div;
     }
 
     /**
      * @return division of `dividend` by `divisor
      */
     public Short divide(short dividend, short divisor) {
-        return null;
+        int s = dividend / divisor;
+        short value = (short) s;
+        return value;
     }
 
     /**
      * @return division of `dividend` by `divisor
      */
     public Byte divide(byte dividend, byte divisor) {
-        return null;
+        int b = dividend / divisor;
+        byte by = (byte)b;
+        return by;
     }
 
     /**
      * @return division of `dividend` by `divisor
      */
     public Float divide(float dividend, float divisor) {
-        return null;
+        float f = dividend / divisor;
+        
+        return f;
     }
 
     /**
      * @return division of `dividend` by `divisor
      */
     public Double divide(double dividend, double divisor) {
-        return null;
+       double div = dividend / divisor;
+       return div;
     }
 
 
      * @return product of `multiplicand` by `multiplier`
      */
     public Integer multiply(int multiplicand, int multiplier) {
-        return null;
+        int mul = multiplicand * multiplier;
+        
+        return mul;
     }
 
     /**
      * @return product of `multiplicand` by `multiplier`
      */
     public Long multiply(long multiplicand, long multiplier) {
-        return null;
+       long mul = multiplicand * multiplier;
+        
+        return mul;
     }
 
     /**
      * @return product of `multiplicand` by `multiplier`
      */
     public Short multiply(short multiplicand, short multiplier) {
-        return null;
+        int s = multiplicand * multiplier;
+        short value = (short) s;
+        return value;
     }
     /**
      * @param multiplicand value to be multiplied
      * @return product of `multiplicand` by `multiplier`
      */
     public Byte multiply(byte multiplicand, byte multiplier) {
-        return null;
+        int b = multiplicand * multiplier;
+        byte by = (byte)b;
+        return by;
     }
 
     /**
      * @return product of `multiplicand` by `multiplier`
      */
     public Float multiply(float multiplicand, float multiplier) {
-        return null;
+        float f = multiplicand * multiplier;
+        
+        return f;
     }
 
     /**
      * @return product of `multiplicand` by `multiplier`
      */
     public Double multiply(double multiplicand, double multiplier) {
-        return null;
+        double  mul = multiplicand * multiplier;
+        
+        return mul;
     }
 
 
       * @return true
      */
     public Boolean returnTrue() {
-        return null;
+        return true;
     }
 
     /**
      * @return false
      */
     public Boolean returnFalse() {
-        return null;
+        return false;
     }
 
 }

PredicateUtilities.java

      * @return true if `x` is greater than `y`
      */
     public Boolean isGreaterThan(int x, int y) {
-        return null;
+        if(x>y)
+        {
+        return true;
+        }
+        return false;
     }
 
     /**
      * @return true if `x` is less than `y`
      */
     public Boolean isLessThan(int x, int y) {
-        return null;
+        if(x<y)
+        {
+        return true;
+        }
+        return false;
     }
 
     /**
      * @return true if `x` is greater than or equal to `y`
      */
     public Boolean isGreaterThanOrEqualTo(int x, int y) {
-        return null;
+        if(x >= y)
+        {
+            return true;
+        }
+        return false;
     }
 
     /**
      * @return true if `x` is less than or equal to `y`
      */
     public Boolean isLessThanOrEqualTo(int x, int y) {
-        return null;
+        if(x <= y)
+        {
+            return true;
+        }
+        return false;
     }
 }

StringUtilities.java

      * @return `Hello World` as a string
      */
     public static String getHelloWorld() {
-        return null;
+        return "Hello World";
     }
 
     /**
      * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
      */
     public static String concatenation(String firstSegment, String secondSegment){
-        return null;
+        String together = firstSegment + secondSegment;//String.format(firstSegment,secondSegment);
+        return together;
     }
 
     /**
      * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
      */
     public static String concatenation(int firstSegment, String secondSegment){
-        return null;
+        String together = firstSegment + secondSegment;
+        return together;
     }
 
     /**
      * @return the first 3 characters of `input`
      */
     public static String getPrefix(String input){
-        return null;
+       
+        return input.substring(0,3);
     }
 
     /**
      * @return the last 3 characters of `input`
      */
     public static String getSuffix(String input){
-        return null;
+        
+        int lenght = input.length();
+        String n = input.substring(input.length() -3);
+        return n;
     }
 
     /**
      * @return the equivalence of two strings, `inputValue` and `comparableValue`
      */
     public static Boolean compareTwoStrings(String inputValue, String comparableValue){
-        return null;
+        if(inputValue == comparableValue)
+        {
+         return true;
+        }
+        return false;
     }
 
     /**
      * @return the middle character of `inputValue`
      */
     public static Character getMiddleCharacter(String inputValue){
-        return null;
+        int i = inputValue.length();
+        int middleC = i/2;
+        char c = inputValue.charAt(middleC);
+        return c;
     }
 
     /**
      * @return the first sequence of characters
      */
     public static String getFirstWord(String spaceDelimitedString){
-        return null;
+        String s[] = spaceDelimitedString.split(" ");
+        return s[0];
     }
 
     /**
      * @return the second word of a string delimited by spaces.
      */
     public static String getSecondWord(String spaceDelimitedString){
-        return null;
+
+       String s[] = spaceDelimitedString.split(" ");
+
+       return s[1];
+       
     }
 
     /**
      * @return an identical string with characters in reverse order.
      */
     public static String reverse(String stringToReverse){
-        return null;
+     StringBuilder reversing = new StringBuilder(stringToReverse);
+     return reversing.reverse().toString();
     }
 }

package.bluej

 #BlueJ package file
-editor.fx.0.height=0
-editor.fx.0.width=0
-editor.fx.0.x=0
-editor.fx.0.y=0
+editor.fx.0.height=722
+editor.fx.0.width=800
+editor.fx.0.x=240
+editor.fx.0.y=26
 objectbench.height=129
-objectbench.width=1171
+objectbench.width=622
 package.divider.horizontal=0.6
-package.divider.vertical=0.7490774907749077
-package.editor.height=399
-package.editor.width=1069
-package.editor.x=59
-package.editor.y=63
-package.frame.height=600
-package.frame.width=1195
+package.divider.vertical=0.7567084078711985
+package.editor.height=400
+package.editor.width=520
+package.editor.x=100
+package.editor.y=100
+package.frame.height=617
+package.frame.width=646
 package.numDependencies=0
 package.numTargets=6
 package.showExtends=true
 target2.width=140
 target2.x=490
 target2.y=70
+target3.association=MathUtilitiesTest
 target3.height=50
 target3.name=MathUtilities
 target3.showInterface=false
 target6.name=MathUtilitiesTest
 target6.showInterface=false
 target6.type=UnitTestTargetJunit4
-target6.width=130
-target6.x=50
-target6.y=90
+target6.width=100
+target6.x=90
+target6.y=120