diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 2fcd81e6e..90d74b0e6 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,6 +1,18 @@
-// Find the maximum
+'use strict'
+
+// find de maximun
+
+function maximun(a , b){
+  if(a > b){
+    return console.log(a)
+  }else{
+    return console.log(b)
+  }
+}
+maximun(10,5)
+
+//find de longest word
 
-// Finding Longest Word
 var words = [
   'mystery',
   'brother',
@@ -10,17 +22,46 @@ var words = [
   'orchard',
   'crackpot'
 ];
+let longestWord = ''
+function findLongestWord(words){
+  for(var i = 0; i < (words.length - 1); i++){
+    if(words[i].length > words[i + 1].length){
+      longestWord = words[i]
+    }
+  }
+  return longestWord
+}
+console.log(findLongestWord(words))
 
-// Calculating a Sum
+//Sum
 
 var numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
+var sum = 0;
+function sumNumbers(numbers){
+  for(var i = 0; i < numbers.length; i++) {
+    sum = sum + numbers[i];
+  }
+  return sum;
+}
+console.log(sumNumbers(numbers))
+
+//Average
 
-// Calculate the Average
+var numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
+var sum = 0;
+var average = 0;
+function averageNumbers (numbers) {
+  for(var i = 0; i < numbers.length; i++) {
+    sum = sum + numbers[i];
+    average = sum / numbers.length
+  }
+  return average
+}
+console.log(averageNumbers(numbers))
 
-var numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
+//Average String
 
-// Array of Strings
-var wordsArr = [
+var words = [
   'seat',
   'correspond',
   'linen',
@@ -32,9 +73,16 @@ var wordsArr = [
   'fuel',
   'palace'
 ];
+function averageString(words){
+var amountLetters = words.join('')
+var average = amountLetters.length / words.length
+return average
+}
+console.log(averageString(words))
 
-// Unique Arrays
-var wordsUnique = [
+//Unique array
+
+var words = [
   'crab',
   'poison',
   'contagious',
@@ -47,9 +95,19 @@ var wordsUnique = [
   'simple',
   'bring'
 ];
+var uniqueWord = [];
+function uniqueArray(words){
+  for(var i = 0; i < words.length; i++){
+    if(words.indexOf(words[i]) === i)
+    uniqueWord.push(words[i])
+  }
+  return(uniqueWord)
+}
+console.log(uniqueArray(words))
 
-// Finding Elements
-var wordsFind = [
+//Search word
+
+var words = [
   'machine',
   'subset',
   'trouble',
@@ -60,8 +118,19 @@ var wordsFind = [
   'disobedience'
 ];
 
-// Counting Repetion
-var wordsCount = [
+function doesWordExist(words, word){
+  for(var i = 0; i < words.length; i ++){
+    if(words[i] === word){
+    return console.log('true');
+    }
+  }
+  return false;
+}
+doesWordExist(words, 'eating')
+
+//How many times
+
+var words = [
   'machine',
   'matter',
   'subset',
@@ -74,6 +143,17 @@ var wordsCount = [
   'disobedience',
   'matter'
 ];
+var count = 0; 
+function howManytimes(words, word){
+  for(var i = 0; i < words.length; i++){
+  if(words[i] === word){
+    count++;
+    }
+  }
+  return count;
+}
+console.log(howManytimes(words,'matter'))
+
 // Bonus Quest
 
 var matrix = [
@@ -98,3 +178,4 @@ var matrix = [
   [20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54],
   [1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]
 ];
+