diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 3a7dbec..79f50bb 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,24 +1,55 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
+function maxOfTwoNumbers(a, b) {
+  return a > b ? a : 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 word of words) {
+      if (word.length > longestWord.length) {
+          longestWord = word;
+      }
+  }
+  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 number of numbers) {
+      sum += number;
+  }
+  return sum;
+}
 
 
 
 // Iteration #3.1 Bonus:
-function sum() {}
+function sum(arr) {
+  let total = 0;
+  for (let item of arr) {
+      if (typeof item === 'number') {
+          total += item;
+      } else if (typeof item === 'string') {
+          total += item.length;
+      } else if (typeof item === 'boolean') {
+          total += item ? 1 : 0;
+      } else {
+          throw new Error("Unsupported data type sir or ma'am");
+      }
+  }
+  return total;
+}
 
 
 
@@ -26,16 +57,25 @@ 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; // Return null for empty array
+  return sumNumbers(numbers) / 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; // Return null for empty array
+  let totalLength = sum(words.map(word => word.length));
+  return totalLength / words.length;
+}
 
 // Bonus - Iteration #4.1
-function avg() {}
+function avg(arr) {
+  if (arr.length === 0) return null; // Return null for empty array
+  const total = sum(arr);
+  return total / arr.length;
+}
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -52,15 +92,28 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
-
+function uniquifyArray(words) {
+  if (words.length === 0) return null; // Return null for empty array
+  const uniqueWords = [];
+  for (let word of words) {
+      if (!uniqueWords.includes(word)) {
+          uniqueWords.push(word);
+      }
+  }
+  return uniqueWords;
+}
 
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
-
+function doesWordExist(words, wordToSearch) {
+  if (words.length === 0) return null; // Return null for empty array
+  for (let word of words) {
+      if (word === wordToSearch) return true;
+  }
+  return false;
+}
 
 
 // Iteration #7: Count repetition
@@ -78,7 +131,13 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(words, wordToCount) {
+  let count = 0;
+  for (let word of words) {
+      if (word === wordToCount) count++;
+  }
+  return count;
+}
 
 
 
@@ -106,7 +165,29 @@ 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;
+
+  // Check horizontally and vertically for maximum product of four adjacent numbers.
+  for (let i = 0; i < matrix.length; i++) {
+      for (let j = 0; j < matrix[i].length; j++) {
+          // Horizontal product
+          if (j < matrix[i].length - 3) {
+              const horizontalProduct = 
+                  matrix[i][j] * matrix[i][j + 1] * matrix[i][j + 2] * matrix[i][j + 3];
+              maxProduct = Math.max(maxProduct, horizontalProduct);
+          }
+          // Vertical product
+          if (i < matrix.length - 3) {
+              const verticalProduct = 
+                  matrix[i][j] * matrix[i + 1][j] * matrix[i + 2][j] * matrix[i + 3][j];
+              maxProduct = Math.max(maxProduct, verticalProduct);
+          }
+      }
+  }
+
+  return maxProduct; // Ensure this returns the maximum product found
+}