diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 3a7dbec41..01384f816 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,19 +1,50 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
-
+function maxOfTwoNumbers(NumOne, NumTwo) { 
+  if (NumOne > NumTwo) {
+    return NumOne;
+  } else { return NumTwo;
+  }
+}
+  
+  
 
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
+function findLongestWord(words) {
+  if (words.length === 0){
+    return null;
+  }
+  let longestWord = words [0]
+
+  for(let i = 1; i < words.length; i++) {
+    if (words[i].length > longestWord.length) {
+      longestWord = words [i];
+    }
+  }
+  return longestWord;
+}
+
 
 
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
+function sumNumbers(numbers) {
+  if (numbers.length === 0){
+    return 0;
+  }
+  let sum = 0;
+
+  for (let i = 0; i < numbers.length; i++) {
+    sum += numbers [i];
+  }
+  return sum;
+}
+
+
 
 
 
@@ -26,13 +57,34 @@ function sum() {}
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
+function averageNumbers(numbers) {
+  if (numbers.length === 0) {
+    return null;
+  }
+  const sum = numbers.reduce ((acc, num) => 
+  acc + num, 0);
+  const average = sum / numbers.length;
+
+  return average;
+}
+
 
 
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
-function averageWordLength() { }
+function averageWordLength(words) {
+  if (words.length === 0) {
+    return null;
+  }
+  const totalLength = words.reduce((acc,word) => acc + word.length, 0);
+  const averageLength = totalLength /
+  words.length;
+
+  return averageLength;
+}
+
+
 
 // Bonus - Iteration #4.1
 function avg() {}
@@ -52,14 +104,39 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
+function uniquifyArray(array) {
+  if ( array.length === 0) {
+    return null;
+  }
+  const uniqueArray = [];
+  array.forEach((element) => {
+    if (uniqueArray.indexOf(element) === -1)
+    {
+      uniqueArray.push(element);
+    }
+  });
+
+  return uniqueArray;
+}
 
 
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(wordArray,
+  targetWord) {
+    if (wordArray.length === 0) {
+      return null;
+    }
+    for (let i = 0; i < wordArray.length; i++)
+    {
+      if (wordArray[i] === targetWord) {
+        return true;
+      }
+    }
+    return false;
+  }
 
 
 
@@ -78,7 +155,19 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(wordArray, targetWord) {
+  if (wordArray.length === 0) {
+    return 0;
+  }
+  let count = 0;
+  for (let i = 0; i < wordArray.length; i++)
+  {
+    if(wordArray[i] === targetWord) {
+      count++;
+    }
+  }
+  return count;
+}