diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 3a7dbec41..becd5bc9c 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,21 +1,51 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
 
+function maxOfTwoNumbers(numOne,numTwo) {
+  if(numOne > numTwo){
+    return numOne
+  } else if (numOne < numTwo){
+    return numTwo
+  } else {
+    return numOne || numTwo
+  }
+}
 
+//console.log(maxOfTwoNumbers(10,7))
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
+function findLongestWord(arrayWord) {
+
+  let longWord = "";
+
+  if(arrayWord.length === 0){
+    return null;
+  }  
+  for(let i of arrayWord){
+    if (i.length > longWord.length ){
+      longWord = i;
+    }
+  }
+  return longWord
+}
 
+//console.log(findLongestWord(words))
 
 
 // Iteration #3: Calculate the sum
-const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
+const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8];
 
-function sumNumbers() {}
+function sumNumbers(numbers) {  
+  let sum = 0;
 
+  for(let i of numbers){
+    sum += i 
+  }
+  return sum
+}
 
+//console.log(numbers)
 
 // Iteration #3.1 Bonus:
 function sum() {}
@@ -26,19 +56,54 @@ function sum() {}
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
+function averageNumbers(numbers) {
+  if (!numbers || numbers.length === 0) {
+    return null;
+  }
+    let sum = 0;
+
+    for (let i of numbers){
+      sum += i
+    }
+  return sum / numbers.length
+}
+
+//console.log(averageNumbers(numbersAvg))
 
 
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
-function averageWordLength() { }
+function averageWordLength(words) {
+  if( !words || words.length === 0 ){
+    return null
+  }
+  let totalWords = 0;
+
+   for (let i  of words){
+    totalWords += i.length;
+   }
+   return totalWords / words.length
+ }
+
+ //console.log(averageWordLength(wordsArr))
 
 // Bonus - Iteration #4.1
 function avg() {}
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
+  'crab',
+  'poison',
+  'contagious',
+  'simple',
+  'bring',
+  'sharp',
+  'playground',
+  'poison',
+  'communion',
+  'simple',
+  'bring',
   'crab',
   'poison',
   'contagious',
@@ -52,15 +117,39 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
-
+function uniquifyArray(wordsUnique) {
+  if ( wordsUnique.length === 0 ) {
+    return null;
+  }
+  let uniqueArray = []
+
+  for (let i of wordsUnique) {
+    if (!uniqueArray.includes(i)) {
+      uniqueArray.push(i)
+    }
+  }
+  return uniqueArray
+}
+  
+//console.log(uniquifyArray(wordsUnique))
 
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist( wordsFind, wordSearch ) {
+  if (wordsFind.length === 0){
+    return null;
+  }
+
+  if (wordsFind.indexOf(wordSearch) !== -1){
+    return true
+  } else {
+    return false
+  }
+}
 
+//console.log(doesWordExist(wordsFind, 'machine'))
 
 
 // Iteration #7: Count repetition
@@ -78,8 +167,22 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(wordsCount, wordToSearch) {
+  if (wordsCount.length === 0) {
+    return 0;
+  }
+
+  let count = 0;
+
+  for (let i = 0; i < wordsCount.length; i++) {
+    if (wordsCount[i] === wordToSearch) {
+      count++;
+    }
+  }
+  return count;
+}
 
+//console.log(howManyTimes(wordsCount, 'matter'));
 
 
 // Iteration #8: Bonus