diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 19b998d0e..8838ec1d4 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,32 +1,86 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
+function maxOfTwoNumbers(num1, num2) {
+  if (num1 > num2) {
+    return num1;
+  } else {
+    return num2;
+  }
+}
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
+function findLongestWord(arrWords) {
+  if (!arrWords.length) return null;
+  let longest = "";
+  for (let i = 0; i < arrWords.length; i++) {
+    if (arrWords[i].length > longest.length) {
+      longest = arrWords[i];
+    } 
+  }
+  return longest;
+}
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
+function sumNumbers(arrNum) {
+  if (!arrNum.length) return 0;
+  let sum = 0;
+  arrNum.forEach(number => {
+    sum += number;
+  });
+  return sum;   
+}
 
 // Iteration #3.1 Bonus:
-function sum() {}
+const mixedArr = [6, 12, 'miami', 1, true, 'barca', '200', 'lisboa', 8, 10]; 
+
+function sum(mixArr) {
+  if (!mixArr.length) return 0;
+  let sum = 0;
+  mixArr.forEach(item => {
+    if (typeof item === 'object') {
+      throw `Unsupported data type sir or ma'am`;
+    }
+    else if (typeof item === 'string') {
+      sum += item.length;
+    } else {
+      sum += item;
+    }
+  });
+  return sum;
+}
 
 // Iteration #4: Calculate the average
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
+function averageNumbers(numArr) {
+  if (!numArr.length) return null;
+  let sum = sumNumbers(numArr);
+  return Math.round(sum/numArr.length);
+}
+
 
 // Level 2: Array of strings
 const wordsArr = ['seat', 'correspond', 'linen', 'motif', 'hole', 'smell', 'smart', 'chaos', 'fuel', 'palace'];
 
-function averageWordLength() {}
+function averageWordLength(wordArr) {
+  if (!wordArr.length) return null;
+  let totalLength = sum(wordArr);
+  return Math.round(totalLength/wordArr.length);
+}
 
 // Bonus - Iteration #4.1
-function avg() {}
+const mixedArr2 = [6, 12, 'miami', 1, true, 'barca', '200', 'lisboa', 8, 10]; // should return: 5.7
+
+function avg(arr) {
+  if (!arr.length) return null;
+  let total = sum(arr);
+  return Math.round((total/arr.length) * 100) / 100;
+}
+
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -43,16 +97,38 @@ const wordsUnique = [
   'bring'
 ];
 
-function uniquifyArray() {}
+function uniquifyArray(wordArr) {
+  if (!wordArr.length) return null;
+  let filtered = [];
+    for (let i=0; i < wordArr.length; i++) {
+      if (filtered.indexOf(wordArr[i]) === -1) {
+        filtered.push(wordArr[i]);
+      }
+    } 
+  return filtered;
+}
 
 // Bonus - Iteration #5.1: Unique arrays using Set
 
-function uniquifyArrayWithSet() {}
+// function uniquifyArrayWithSet(wordArr) {
+//   let set = new Set(wordArr);
+//   return [...set];  
+// }
+
+function uniquifyArrayWithSet(wordArr) {
+  if (!wordArr.length) return null;
+  return [...(new Set(wordArr))];
+}
+
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(wordArr, word) {
+  if (!wordArr.length) return null;
+  return wordArr.includes(word);
+}
+
 
 // Iteration #7: Count repetition
 const wordsCount = [
@@ -69,7 +145,16 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(wordArr, word) {
+  if (!wordArr.length) return 0;
+  let counter = 0;
+  wordArr.forEach(item => {
+    if (item === word ) {
+      counter++;
+    }
+  });
+  return counter;
+}
 
 // The following is required to make unit tests work.
 /* Environment setup. Do not modify the below code. */
diff --git a/tests/functions-and-arrays.spec.js b/tests/functions-and-arrays.spec.js
index 736f06098..a75e55bde 100644
--- a/tests/functions-and-arrays.spec.js
+++ b/tests/functions-and-arrays.spec.js
@@ -93,7 +93,7 @@ describe('Calculate the sum of array of numbers', () => {
   test('should return the sum when passed array of numbers', () => {
     expect(sumNumbers([10, 5, 4, 32, 8])).toBe(59);
   });
-});
+}); 
 
 describe('Bonus: Calculate the sum', () => {
   test('should declare a function named sum', () => {