diff --git a/src/functions-and-arrays.js b/src/functions-and-arrays.js
index 19b998d0e..5e9569ae2 100644
--- a/src/functions-and-arrays.js
+++ b/src/functions-and-arrays.js
@@ -1,32 +1,130 @@
 // Iteration #1: Find the maximum
-function maxOfTwoNumbers() {}
+function maxOfTwoNumbers(x,y) {
+  if (x>y){
+    return x
+  } else {
+    return y
+  }
+}
 
 // Iteration #2: Find longest word
 const words = ['mystery', 'brother', 'aviator', 'crocodile', 'pearl', 'orchard', 'crackpot'];
 
-function findLongestWord() {}
+function findLongestWord(w) {
+  if (w.length === 0){
+    return null
+  } else {
+    let length = []
+    for (i=0; i<w.length; i++){
+      length[i] = w[i].length
+    }
+    return w[length.indexOf(Math.max(...length))]
+  }
+}
+
+findLongestWord(words)
 
 // Iteration #3: Calculate the sum
 const numbers = [6, 12, 1, 18, 13, 16, 2, 1, 8, 10];
 
-function sumNumbers() {}
+function sumNumbers(n) {
+  let sum = 0
+  for (let i=0; i<n.length; i++){
+    sum += n[i]
+  }
+  return sum
+}
+
+sumNumbers(numbers)
 
 // Iteration #3.1 Bonus:
-function sum() {}
+
+const mixedArr = [6, 12, 'miami', 1, true, 'barca', '200', 'lisboa', 8, 10]
+
+function sum(n) {
+  if (n.length === 0){
+    return 0
+  }
+  let total = 0
+  for (let i=0; i<n.length; i++){
+    if (typeof n[i] === 'object' || typeof n[i] === 'array'){
+      throw new Error("Unsupported data type sir or ma'am")
+    } else if (typeof n[i] === 'string' && typeof n[i] !== 'number'){
+      total += n[i].length
+    } else if (typeof n[i] === "string"){
+      total += Number(n[i])
+    } else if (typeof n[i] === "true"){
+      total+=1
+    } else{
+      total += n[i]
+    }
+  }
+  return total
+   
+  }
+
+sum(mixedArr)
 
 // Iteration #4: Calculate the average
 // Level 1: Array of numbers
 const numbersAvg = [2, 6, 9, 10, 7, 4, 1, 9];
 
-function averageNumbers() {}
+function averageNumbers(n) {
+  if (n.length === 0){
+    return null
+  }
+  let total=0
+  for (let i = 0; i<n.length; i++){
+    total += n[i]
+  }
+  let average = total/n.length
+  return average
+}
+
+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(w) {
+  if (w.length === 0){
+    return null
+  }
+  let totalLength = 0
+  for (let i = 0; i < w.length; i++){
+    totalLength += w[i].length
+  }
+  let averageWordLength = totalLength/w.length
+  return averageWordLength
+}
+
+averageWordLength(wordsArr)
 
 // Bonus - Iteration #4.1
-function avg() {}
+
+function avg(n) {
+  if (n.length === 0){
+    return null
+  }
+  let total = 0
+  for (let i=0; i<n.length; i++){
+    if (typeof n[i] === 'object' || typeof n[i] === 'array'){
+      throw new Error("Unsupported data type sir or ma'am")
+    } else if (typeof n[i] === 'string' && typeof n[i] !== 'number'){
+      total += n[i].length
+    } else if (typeof n[i] === "string"){
+      total += Number(n[i])
+    } else if (typeof n[i] === "true"){
+      total+=1
+    } else{
+      total += n[i]
+    }
+  }
+  let average = Number((total/n.length).toFixed(2))
+  return average
+  }
+
+avg(mixedArr)
 
 // Iteration #5: Unique arrays
 const wordsUnique = [
@@ -42,17 +140,56 @@ const wordsUnique = [
   'simple',
   'bring'
 ];
+array = []
+
+function uniquifyArray(w) {
+  if (w.length === 0){
+    return null
+  }
+  let words = []
+  for (let i = 0; i<w.length; i++){
+    if (words.indexOf(w[i]) === -1){
+      words.push(w[i])
+    }
+  }
+  return words
+}
+
+uniquifyArray(wordsUnique)
 
-function uniquifyArray() {}
 
 // Bonus - Iteration #5.1: Unique arrays using Set
 
-function uniquifyArrayWithSet() {}
+function uniquifyArrayWithSet(w) {
+  if (w.length === 0){
+    return null
+  } else {
+    let mySet = new Set()
+    for (let i = 0; i<w.length; i++){
+      mySet.add(w[i])
+    }
+    array = Array.from(mySet)
+    return array
+  }
+}
+
+uniquifyArrayWithSet(wordsUnique)
 
 // Iteration #6: Find elements
 const wordsFind = ['machine', 'subset', 'trouble', 'starting', 'matter', 'eating', 'truth', 'disobedience'];
 
-function doesWordExist() {}
+function doesWordExist(arr, word) {
+  if (arr.length === 0){
+    return null
+  }
+  let flag = false
+  for (let i = 0; i<arr.length; i++){
+    if (word === arr[i]){
+      flag = true
+    }
+  }
+  return flag
+}
 
 // Iteration #7: Count repetition
 const wordsCount = [
@@ -69,7 +206,15 @@ const wordsCount = [
   'matter'
 ];
 
-function howManyTimes() {}
+function howManyTimes(arr, word) {
+  count = 0
+  for (let i = 0; i<arr.length; i++){
+    if (word === arr[i]){
+      count++
+    }
+  }
+  return count
+}
 
 // The following is required to make unit tests work.
 /* Environment setup. Do not modify the below code. */