diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..b9c8ec9f 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -10,17 +10,18 @@
 */
 
 // Example 1
+// We didn't give a value to a variable a
 let a;
 console.log(a);
 
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+    let message = "Hello"; // we have to return something
 }
 
 let hello = sayHello();
-console.log(hello);
+console.log(hello); // we need quotation marks 
 
 
 // Example 3
@@ -28,9 +29,9 @@ function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
 
-sayHelloToUser();
+sayHelloToUser(); // there is not argument  
 
 
 // Example 4
 let arr = [1,2,3];
-console.log(arr[3]);
+console.log(arr[3]); // there are only 3 elements in the array. The last index should be 2
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..8ad2b1af 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,18 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    if (n === 0) {
+        console.log("nothing")
+    } else {
+    let i = 0;
+    let newString = "";
+    while (i < n) {
+         newString = newString + 2*i + ",";
+         i++;    
+        } 
+    console.log(newString.substring(0, newString.length-1));
+    }
 }
-
 evenNumbers(3); // should output 0,2,4
 evenNumbers(0); // should output nothing
 evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..73cd1b97 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,7 +17,12 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+    
+    let i = 0;
+    while (birthdays[i].substring(0, 4) !== "July") {
+       i++;
+    }
+    return birthdays[i];
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..f05ea323 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,7 +7,15 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let i = 0; 
+    let sum = 0; 
+    do {
+        sum = sum + 2*i;
+        i++;    
+    }   
+
+    while (i < n);
+    return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..800c2b66 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,15 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
+
 let i = 0;
 while(i < 26) {
     console.log(String.fromCharCode(97 + i));
     i++;
 }
+
+
+for (let i = 0; i < 26; i++) {
+    console.log(String.fromCharCode(97 + i));
+}
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
index 081002b2..e5a08e81 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,6 +27,13 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for (i = 0; i < WRITERS.length; i++) {
+    console.log(WRITERS[i] + " is " + AGES[i] + " years old");
+}
+
+
+
+
 
 /*
 The output should look something like this:
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
index 65585c6a..797e0a0b 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,15 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (let station of tubeStations) {
+    console.log(station);
+}
+
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (let letter of str) {
+    console.log(letter.toUpperCase());
+}
\ No newline at end of file
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..611e7fd8 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+    let answer = [];
+    for (let i = 0; i < cities.length; i ++) {        
+        answer.push("The temperature in " + cities[i] + " is " + temperatureService(cities[i]) + " degrees")
+    }
+    return answer;
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..ed2fd6ed 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,7 +10,11 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+  let randomNum = 0; 
+  do {
+      randomNum = generateRandomNumber();
+  } while (randomNum <=50);
+  return randomNum; 
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..936ede58 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -5,7 +5,13 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let newArticle = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        if (allArticleTitles[i].length <= 65) { 
+        newArticle.push(allArticleTitles[i])
+        } 
+    } 
+    return newArticle;
 }
 
 /*
@@ -14,7 +20,17 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
+    let minWord = allArticleTitles[0].split(" ").length;
+    let j = 0; 
+    for (let i = 0; i < allArticleTitles.length; i++ ) {
+        if (allArticleTitles[i].split(" ").length < minWord) {
+            minWord = allArticleTitles[i].split(" ").length;
+            j = i;
+        }
+        
+    }
+    return allArticleTitles[j];
+    
 }
 
 /*
@@ -23,7 +39,15 @@ function titleWithFewestWords(allArticleTitles) {
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
+    let arrNum = []; 
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        for (let j = 0; j <= 9; j++) {
+            if (allArticleTitles[i].includes(j) && !arrNum.includes(allArticleTitles[i]))  {
+                arrNum.push(allArticleTitles[i]);
+            } 
+        }
+    } 
+    return arrNum;
 }
 
 /*
@@ -31,7 +55,11 @@ function headlinesWithNumbers(allArticleTitles) {
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+    let sum = 0; 
+    for (let i = 0; i < allArticleTitles.length; i++) {
+        sum = sum + allArticleTitles[i].length;
+    } 
+    return Math.round(sum/allArticleTitles.length);
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..5c3dd7b9 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -34,8 +34,16 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
-}
+        let averageArr = [];
+        for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+            let sumAverage = 0;
+            for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+                sumAverage = sumAverage + closingPricesForAllStocks[i][j];
+            } 
+            averageArr.push(Math.round(sumAverage/closingPricesForAllStocks[i].length * 100) / 100);      
+        }
+        return averageArr; 
+    }
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -48,7 +56,11 @@ function getAveragePrices(closingPricesForAllStocks) {
     The price change value should be rounded to 2 decimal places, and should be a number (not a string)
 */
 function getPriceChanges(closingPricesForAllStocks) {
-    // TODO
+    let priceChange = [];
+      for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        priceChange.push(Math.round((closingPricesForAllStocks[i][closingPricesForAllStocks[i].length-1] - closingPricesForAllStocks[i][0]) * 100) / 100);
+    }
+    return priceChange;
 }
 
 /*
@@ -64,7 +76,18 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+    let maxPrice = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let highestPrice = closingPricesForAllStocks[i][0];
+        for (let j = 0; j < closingPricesForAllStocks[i].length; j++) {
+            if (closingPricesForAllStocks[i][j] > highestPrice) {
+                highestPrice = closingPricesForAllStocks[i][j];
+            }             
+        }
+        let str = "The highest price of " + stocks[i].toUpperCase() + " in the last 5 days was " + highestPrice.toFixed(2);
+        maxPrice.push(str);
+    } 
+    return maxPrice;
 }
 
 
diff --git a/3-extra/1-factorial.js b/3-extra/1-factorial.js
index 31f8052c..d3d939da 100644
--- a/3-extra/1-factorial.js
+++ b/3-extra/1-factorial.js
@@ -9,7 +9,11 @@
 */
 
 function factorial(input) {
-    // TODO
+    let production = 1; 
+    for (let i = 1; i <=input; i++ ) {
+        production = production * i;
+    }
+    return production;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/3-extra/2-array-of-objects.js b/3-extra/2-array-of-objects.js
index ee57960f..224603f1 100644
--- a/3-extra/2-array-of-objects.js
+++ b/3-extra/2-array-of-objects.js
@@ -11,7 +11,7 @@
 */
 
 function getHighestRatedInEachGenre(books) {
-    // TODO
+    
 }
 
 
diff --git a/3-extra/3-fibonacci.js b/3-extra/3-fibonacci.js
index 9ef9aec7..30c1ffc7 100644
--- a/3-extra/3-fibonacci.js
+++ b/3-extra/3-fibonacci.js
@@ -14,7 +14,12 @@
 */
 
 function generateFibonacciSequence(n) {
-    // TODO
+    let fibArr = [0, 1];
+    for (let i = 0; i < n-2; i++ ) {
+        fibArr.push(fibArr[fibArr.length-1] + fibArr[fibArr.length-2]);
+
+    } 
+    return fibArr;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */