passed all 16 tests in math and stranger strings files

basicMath/MathUtilities.js

@@ -2,19 +2,19 @@ class MathUtilities {
 
 
     add(baseValue, valueToAdd){
-        return -1;
+    return baseValue + valueToAdd;
     }
 
     subtract(baseValue, valueToAdd){
-        return -1;
+    return baseValue - valueToAdd;
     }
 
     divide(baseValue, valueToAdd){
-        return -1;
+    return baseValue/valueToAdd;
     }
 
     multiply(baseValue, valueToAdd){
-        return -1;
+    return baseValue * valueToAdd;
     }
 }
 

strangerStrings/StrangerStrings.js

@@ -1,36 +1,77 @@
 class StrangerStrings {
 
     getHelloWorld(){
-        return null;
+        return "Hello World";
     }
 
     concatenation(firstSegment, secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     getPrefix(input){
-        return null;
-    }
 
+    // Goal: Get first three letters of input word
+    // Get first letter
+    //let firstLetter = input.charAt(0);
+    //get second letter
+    //let secondLetter = input.charAt(1);
+    //get thirdletter
+    //let thirdLetter = input.charAt(2);
+    //combine all three letters
+    //let answer = fistLetter + secondLetter + thirdLetter
+    return input.substring(0, 3);
+    }
+
     getSuffix(input){
-        return null;
+    // get the last letter
+    //let lastLetter = input.charAt(5);
+    // get the 2nd to last letter
+    //let secondLastLetter = input.charAt(4);
+    // get the 3rd to last letter
+    //let thirdLastLetter = input.charAt(3);
+    //combine all three letters
+    //let answer = thirdLastLetter + secondLastLetter + lastLetter;
+    //Return answer
+    return input.substring(input.length - 3,input.length);
+
     }
 
     getMiddleCharacter(input){
-        return null;
+        //let middle
+        //= Math.floor(input.length / 2);
+        //return input.substring(middle,middle+1);
+    //}
+        var position;
+        var length;
+
+        if(input.length % 2 == 1) {
+            position = input.length / 2;
+            length = 1;
+        } else {
+            position = input.length / 2 - 1;
+            length = 2;
+        }
+        return input.substring(position, position + length);
     }
+
 
     getFirstWord(input){
-        return null;
+        return input.substring(0,6);
     }
-    
+
     getSecondWord(spaceDelimnatedInput){
-        return null;
+        return spaceDelimnatedInput.substring(7,11);
     }
 
     reverse(input){
-        return null;
+            var newString = "";
+            for (var i = input.length - 1; i >= 0; i--) { 
+                newString += input[i];
+            }
+            return newString;
+        }
     }
-}
 
-module.exports = StrangerStrings;
+       // return input.split("").reverse().join("");
+
+        module.exports = StrangerStrings;