diff --git a/exercises.js b/exercises.js
index 6364db9..4c1d4a8 100644
--- a/exercises.js
+++ b/exercises.js
@@ -1,11 +1,26 @@
 //Do not change any of the function names
-
 function getBiggest(x, y) {
+  if (x > y){
+        return x;
+    } else if (x === y){
+        return x;
+    } else {
+        return y;
+    }
   //x and y are integers.  Return the larger integer
   //if they are the same return either one
 }
 
 function greeting(language) {
+  if (language === 'German'){
+        return 'Guten Tag!';
+    } else if (language === 'English'){
+        return 'Hello!';
+    } else if (language === 'Spanish'){
+        return 'Hola!';
+    } else {
+        return 'Hello!';
+    }
   //return a greeting for three different languages:
   //language: 'German' -> 'Guten Tag!'
   //language: 'English' -> 'Hello!'
@@ -14,15 +29,30 @@ function greeting(language) {
 }
 
 function isTenOrFive(num) {
+  if (num === 5 || num === 10){
+        return true;
+    } else{
+        return false;
+    }
   //return true if num is 10 or 5
   //otherwise return false
 }
 
 function isInRange(num) {
+  if (num > 20 && num < 50){
+        return true;
+    } else{
+        return false;
+    }
   //return true if num is less than 50 and greater than 20
 }
 
 function isInteger(num) {
+  if(num % 1 === 0) {
+    return true;
+} else{
+    return false;
+}
   //return true if num is an integer
   //0.8 -> false
   //1 -> true
@@ -32,72 +62,127 @@ function isInteger(num) {
 }
 
 function fizzBuzz(num) {
+  if (num % 3 === 0 && num % 5 === 0){
+    return 'fizzbuzz';
+} else if (num % 5 === 0){
+    return 'buzz';
+}else if (num % 3 === 0){
+    return 'fizz';
+} else {
+    return num;
+}
   //if num is divisible by 3 return 'fizz'
   //if num is divisible by 5 return 'buzz'
   //if num is divisible by 3 & 5 return 'fizzbuzz'
   //otherwise return num
 }
-
+//I'm not working
 function isPrime(num) {
+  for(var i = 0; i < 5; i++){
+    while (i < 2){
+        i++;
+    }
+    if (num === 0 || num === 1){
+      return false;
+    }
+    else if (num % i != 0){
+        return true;
+    }else {
+        return false;
+    }
   //return true if num is prime.
   //otherwise return false
   //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
 }
+}
 
 function returnFirst(arr) {
+  var retFirst = arr[0];
+  return retFirst;
   //return the first item from the array
 }
 
 function returnLast(arr) {
+  var retLast = arr[arr.length-1];
+  return retLast;
   //return the last item of the array
 }
 
 function getArrayLength(arr) {
+  return arr.length;
   //return the length of the array
 }
 
 function incrementByOne(arr) {
-  //arr is an array of integers  
+  for (var i = 0; i < arr.length; i++){
+    arr[i]++;
+  }
+  return arr;
+  //arr is an array of integers
   //increase each integer by one
   //return the array
 }
 
 function addItemToArray(arr, item) {
+  arr.push(item);
+  return arr;
   //add the item to the end of the array
   //return the array
 }
 
 function addItemToFront(arr, item) {
+  arr.unshift(item);
+  return arr;
   //add the item to the front of the array
   //return the array
   //hint: use the array method .unshift
 }
-
+//im not working
 function wordsToSentence(words) {
+  return words.join(' ');
   //words is an array of strings
   //return a string that is all of the words concatenated together
   //spaces need to be between each word
   //example: ['Hello', 'world!'] -> 'Hello world!'
 }
-
+//I'm not working
 function contains(arr, item) {
+  if (arr.indexOf(item) != -1) {
+    return true;
+  } else {
+    return false;
+  }
   //check to see if item is inside of arr
   //return true if it is, otherwise return false
 }
 
 function addNumbers(numbers) {
+  var sum = 0;
+  for (var i = 0; i < numbers.length; i++){
+    sum += (numbers[i]);
+  }
+  return sum;
   //numbers is an array of integers.
   //add all of the integers and return the value
 }
 
 function averageTestScore(testScores) {
+  var average = 0;
+  var sum = 0;
+  for (var i = 0; i < testScores.length; i++){
+  sum += testScores[i];
+  average = sum / testScores.length;
+  }
+  return average;
   //testScores is an array.  Iterate over testScores and compute the average.
   //return the average
 }
 
 function largestNumber(numbers) {
+  var max = Math.max.apply(null, numbers);
+  return max;
   //numbers is an array of integers
   //return the largest integer
 }