diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 3a7dbec41..a22cead3e 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,24 +1,68 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
+function maxOfTwoNumbers(a, b) {
+  if (a > b) {
+    return a;
+  } else {
+    return b;
+  }
+} 
 
 
 
 // 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) {
+  let sum = 0;
+  for (let i = 0; i < numbers.length; i++) {
+    sum += numbers[i];
+  }
+  return sum;
+}
 
 
 
 // Iteration #3.1 Bonus:
-function sum() {}
+function sum(arr) {
+  let total = 0;
+  
+  for (let i = 0; i < arr.length; i++) {
+    if (typeof arr[i] === 'number') {
+      total += arr[i];
+    } else if (typeof arr[i] === 'string') {
+      total += arr[i].length;
+    } else if (typeof arr[i] === 'boolean') {
+      total += arr[i] ? 1 : 0;
+    } else {
+      throw new Error('Unsupported data type');
+    }
+  }
+  
+  return total;
+}
+
+
 
 
 
@@ -26,16 +70,45 @@ 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);
+  return sum / numbers.length;
+}
 
 
 // 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);
+  return totalLength / words.length;
+}
+
+
+
 
 // Bonus - Iteration #4.1
-function avg() {}
+function avg(arr) {
+  if (arr.length === 0) return null; // Devuelve null si el array está vacío
+  const total = arr.reduce((acc, val) => {
+    if (typeof val === 'number') {
+      return acc + val;
+    } else if (typeof val === 'string') {
+      return acc + val.length;
+    } else if (typeof val === 'boolean') {
+      return acc + (val ? 1 : 0);
+    } else {
+      throw new Error('Unsupported data type');
+    }
+  }, 0);
+  return parseFloat((total / arr.length)); // Calcula el promedio y lo redondea a 2 decimales
+}
+
+
+
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -52,14 +125,20 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
+function uniquifyArray(wordsUnique) {
+  if (wordsUnique.length === 0) return null;
+  return [...new Set(wordsUnique)];
+}
 
 
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(wordsFind, word) {
+  if (wordsFind.length === 0) return null;
+  return wordsFind.includes(word);
+}
 
 
 
@@ -78,7 +157,11 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(wordsCount, word) {
+  if (wordsCount.length === 0) return 0;
+  return wordsCount.reduce((count, currentWord) => currentWord === word ? count + 1 : count, 0)
+
+}
 
 
 
@@ -106,8 +189,28 @@ const matrix = [
   [1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48]
 ];
 
-function greatestProduct() {}
+function greatestProduct(matrix) {
+let maxProduct = 0;
+  for (let i = 0; i < matrix.length; i++) {
+    for (let j = 0; j < matrix[i].length - 3; j++) {
+      const product = matrix[i][j] * matrix[i][j+1] * matrix[i][j+2] * matrix[i][j+3];
+      if (product > maxProduct) {
+        maxProduct = product;
+      }
+    }
+
+}
+for (let i = 0; i < matrix.length - 3; i++) {
+  for (let j = 0; j < matrix[i].length; j++) {
+    const product = matrix[i][j] * matrix[i+1][j] * matrix[i+2][j] * matrix[i+3][j];
+    if (product > maxProduct) {
+      maxProduct = product;
+    }
+  }
+}
 
+return maxProduct;
+}