diff --git a/.gitignore b/.gitignore
index 3c3629e..f6a921b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 node_modules
+.vscode/
\ No newline at end of file
diff --git a/exercises.js b/exercises.js
index 6364db9..31156ca 100644
--- a/exercises.js
+++ b/exercises.js
@@ -3,6 +3,11 @@
 function getBiggest(x, y) {
   //x and y are integers.  Return the larger integer
   //if they are the same return either one
+  if (x >= y) {
+    return x;
+  } else {
+    return y;
+  }
 }
 
 function greeting(language) {
@@ -11,15 +16,34 @@ function greeting(language) {
   //language: 'English' -> 'Hello!'
   //language: 'Spanish' -> 'Hola!'
   //if language is undefined return 'Hello!'
+  if (language === 'German') {
+    return 'Guten Tag!';
+  } else if (language === 'English') {
+    return 'Hello!';
+  } else if (language === 'Spanish') {
+    return 'Hola!';
+  } else {
+    return 'Hello!';
+  }
 }
 
 function isTenOrFive(num) {
   //return true if num is 10 or 5
   //otherwise return false
+  if (num === 10 || num === 5) {
+    return true;
+  } else {
+    return false;
+  }
 }
 
 function isInRange(num) {
   //return true if num is less than 50 and greater than 20
+  if (num < 50 && num > 20) {
+    return true;
+  } else {
+    return false;
+  }
 }
 
 function isInteger(num) {
@@ -29,6 +53,12 @@ function isInteger(num) {
   //-10 -> true
   //otherwise return false
   //hint: you can solve this using Math.floor
+  if (num === Math.floor(num)) {
+    return true;
+  } else {
+    return false;
+  }
+
 }
 
 function fizzBuzz(num) {
@@ -36,6 +66,15 @@ function fizzBuzz(num) {
   //if num is divisible by 5 return 'buzz'
   //if num is divisible by 3 & 5 return 'fizzbuzz'
   //otherwise return num
+  if (num % 3 === 0 && num % 5 === 0) {
+    return 'fizzbuzz';
+  } else if (num % 3 === 0) {
+    return 'fizz';
+  } else if (num % 5 === 0) {
+    return 'buzz';
+  } else {
+    return num;
+  }
 }
 
 function isPrime(num) {
@@ -44,35 +83,57 @@ function isPrime(num) {
   //hint: a prime number is only evenly divisible by itself and 1
   //hint2: you can solve this using a for loop
   //note: 0 and 1 are NOT considered prime numbers
+  if (num > 1) {
+    for (var i = 2; i < num; i++) {
+      if (num % i === 0) {
+        return false;
+      }
+    }
+    return true;
+  } else {
+    return false;
+  }
+
 }
 
 function returnFirst(arr) {
   //return the first item from the array
+  return arr[0];
 }
 
 function returnLast(arr) {
   //return the last item of the array
+  return arr[arr.length - 1];
 }
 
 function getArrayLength(arr) {
   //return the length of the array
+  return arr.length;
 }
 
 function incrementByOne(arr) {
   //arr is an array of integers  
   //increase each integer by one
   //return the array
+  for (var i = 0; i < arr.length; i++) {
+    arr[i]++;
+  }
+  return arr;
 }
 
 function addItemToArray(arr, item) {
   //add the item to the end of the array
   //return the array
+  arr.push(item);
+  return arr;
 }
 
 function addItemToFront(arr, item) {
   //add the item to the front of the array
   //return the array
   //hint: use the array method .unshift
+  arr.unshift(item);
+  return arr;
 }
 
 function wordsToSentence(words) {
@@ -80,26 +141,45 @@ function wordsToSentence(words) {
   //return a string that is all of the words concatenated together
   //spaces need to be between each word
   //example: ['Hello', 'world!'] -> 'Hello world!'
+  return words.join(' ');
 }
 
 function contains(arr, item) {
   //check to see if item is inside of arr
   //return true if it is, otherwise return false
+  return arr.indexOf(item) > -1;
 }
 
 function addNumbers(numbers) {
   //numbers is an array of integers.
   //add all of the integers and return the value
+  var total = 0;
+  for (var i in numbers) {
+    total += numbers[i];
+  }
+  return total;
 }
 
 function averageTestScore(testScores) {
   //testScores is an array.  Iterate over testScores and compute the average.
   //return the average
+  var total = 0;
+  for (var i in testScores) {
+    total += testScores[i];
+  }
+  return total / testScores.length;
 }
 
 function largestNumber(numbers) {
   //numbers is an array of integers
   //return the largest integer
+  var greatest = numbers[0];
+  for (var i = 0; i < numbers.length; i++) {
+    if (greatest <= numbers[i]) {
+      greatest = numbers[i];
+    }
+  }
+  return greatest;
 }
 
 //Do not modify code below this line.
@@ -124,4 +204,4 @@ module.exports = {
   addNumbers: addNumbers,
   averageTestScore: averageTestScore,
   largestNumber: largestNumber
-};
+};
\ No newline at end of file