diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..df1d4502 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -10,27 +10,27 @@
 */
 
 // Example 1
-let a;
+let a;           // a is not assigned any value
 console.log(a);
 
 
 // Example 2
-function sayHello() {
-    let message = "Hello";
+function sayHello() {        // there is no return statement, and the message variable is defined inside the function so it is not read, 
+    let message = "Hello";    // there are no parameters for the function
 }
 
-let hello = sayHello();
+let hello = sayHello();    
 console.log(hello);
 
 
 // Example 3
-function sayHelloToUser(user) {
+function sayHelloToUser(user) {       // we don't pass any parameters into the function
     console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
 
 
-// Example 4
+// Example 4            // there is nothing in the array at index 3
 let arr = [1,2,3];
 console.log(arr[3]);
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..0c02497f 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -6,9 +6,17 @@
 */
 
 function evenNumbers(n) {
-    // TODO
+    let i = 0;
+    let evenNum = '';
+    while (n>0) {
+        evenNum= evenNum + i + ',';
+        i+=2;
+        n--;
+    }
+    return evenNum;
 }
+console.log(evenNumbers(3))
 
-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
+// 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..2b414b46 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 firstJulyBirthday= '';
+    for (let i=0; i<birthdays.length; i++){
+        if (birthdays[i] === 'July 11th')
+        firstJulyBirthday = birthdays[i];
+    }
+    return firstJulyBirthday
 }
 
 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..aace3fab 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -7,9 +7,16 @@
 */
 
 function evenNumbersSum(n) {
-    // TODO
+    let evenNum=0;
+    let sum =0;
+    while (n>0) {
+        sum = sum+evenNum;
+        evenNum=evenNum+2;
+        n--;
+    }
+    return sum
 }
 
-console.log(evenNumbersSum(3)); // should output 6
+console.log(evenNumbersSum(3)); // should output 6 
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
\ No newline at end of file
+console.log(evenNumbersSum(10)); // should output 90 
\ No newline at end of file
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
index db5fac64..d0ae3f5a 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,13 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+// let i = 0;
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
+// The output shouldn't change.
+
+for (let i=0; i<26; i++){
     console.log(String.fromCharCode(97 + i));
-    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..efcd51ed 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -26,7 +26,16 @@ const AGES = [
     49
 ];
 
-// TODO - Write for loop code here
+for (let i=0; i<WRITERS.length; i++){
+    for (let j=0; j<AGES.length; j++){
+        if (i===j){
+            console.log(WRITERS[i]+' is '+AGES[j]+' 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..21390ea2 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -11,6 +11,13 @@ let tubeStations = [
     "Tottenham Court Road"
 ];
 
+for (let i=0; i<tubeStations.length; i++){
+    console.log(tubeStations[i])
+}
+
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+for (let i=0; i<str.length; i++){
+    console.log(str[i].toLocaleUpperCase())
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..11738b6c 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -12,7 +12,12 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
+        let tempOf=[];
+        for (let i=0; i<cities.length; i++){
+            let degree= temperatureService(cities[i]);
+            tempOf.push(`The temperature in ${cities[i]} is ${degree} degrees`)
+        }
+    return tempOf
 }
 
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..8483d7c2 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -10,10 +10,17 @@ function generateRandomNumber() {
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+    let number;
+    do {
+       number = generateRandomNumber();
+    }
+    while (number < 50)
+    return number;
 }
 
-/* ======= TESTS - DO NOT MODIFY ===== */
+
+
+// /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("Returned value should always be greater than 50", () => {
     expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..b5b0ea1c 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -4,8 +4,16 @@
     The home page of the web site has a headline section, which only has space for article titles which are 65 characters or less.
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
+
+
 function potentialHeadlines(allArticleTitles) {
-    // TODO
+    let newArr =[];
+    for (let i=0; i<allArticleTitles.length; i++){
+        if (allArticleTitles[i].length <= 65 ){
+            newArr.push(allArticleTitles[i])
+        }
+    }
+    return newArr;
 }
 
 /*
@@ -14,8 +22,20 @@ function potentialHeadlines(allArticleTitles) {
     (you can assume words will always be seperated by a space)
 */
 function titleWithFewestWords(allArticleTitles) {
-    // TODO
-}
+    
+    let countLength = allArticleTitles[0].split(" ").length;
+    let shortTitle;
+
+    for (let i=0; i<allArticleTitles.length; i++){
+        if (countLength > allArticleTitles[i].split(" ").length) {
+            countLength = allArticleTitles[i].split(" ").length
+            console.log(allArticleTitles[i])
+            shortTitle = allArticleTitles[i]
+        }
+        }
+        return shortTitle
+    }
+
 
 /*
     The editor of the FT has realised that headlines which have numbers in them get more clicks!
@@ -23,16 +43,30 @@ 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 newArr=[]
+    for (let i=0; i<allArticleTitles.length; i++){  
+        if (allArticleTitles[i].match(/[0-9]/g)){
+            newArr.push(allArticleTitles[i])
+        }
+    }
+    return newArr
 }
 
+
 /*
     The Financial Times wants to understand what the average number of characters in an article title is.
     Implement the function below to return this number - rounded to the nearest integer.
 */
 function averageNumberOfCharacters(allArticleTitles) {
-    // TODO
+    let averageChar;
+    let sum= 0;
+    for (let i=0; i<allArticleTitles.length; i++){
+        sum = sum + allArticleTitles[i].length;
+        averageChar=  sum / allArticleTitles.length
+    }
+    return Math.round(averageChar)
 }
+// console.log(averageNumberOfCharacters(ARTICLE_TITLES))
 
 
 
@@ -50,7 +84,7 @@ const ARTICLE_TITLES = [
     "Brussels urges Chile's incoming president to endorse EU trade deal",
 ];
 
-/* ======= TESTS - DO NOT MODIFY ===== */
+// /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("should only return potential headlines", () => {
     expect(new Set(potentialHeadlines(ARTICLE_TITLES))).toEqual(new Set([
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..60a97b22 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -34,8 +34,18 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+    let average =[]
+    let stockSum =0;
+    for (let i=0; i<closingPricesForAllStocks.length; i++){
+        stockSum=0
+       for (let j=0; j<closingPricesForAllStocks[i].length; j++){
+            stockSum = stockSum + closingPricesForAllStocks[i][j];
+       }
+       average.push(Number((stockSum/closingPricesForAllStocks[i].length).toFixed(2)))
+    }
+    return average
 }
+ //console.log(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS))
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -48,8 +58,16 @@ 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 priceChangeArr=[]
+      
+    for (price of closingPricesForAllStocks) {
+        let priceChange = Number((price[price.length -1] - price[0]).toFixed(2));
+        priceChangeArr.push(priceChange);
+    }
+    return priceChangeArr;
 }
+    
+// console.log(getPriceChanges(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS))
 
 /*
     As part of a financial report, we want to see what the highest price was for each stock in the last 5 days.
@@ -64,11 +82,16 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
-    // TODO
+      highestPriceLast5Days = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        highestPriceLast5Days.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${Math.max(...closingPricesForAllStocks[i]).toFixed(2)}`);
+    }
+    return highestPriceLast5Days;
 }
+ //console.log(highestPriceDescriptions(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS,STOCKS))
 
 
-/* ======= TESTS - DO NOT MODIFY ===== */
+// /* ======= TESTS - DO NOT MODIFY ===== */
 test("should return the average price for each stock", () => {
     expect(getAveragePrices(CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS)).toEqual(
         [176.89, 335.66, 3405.66, 2929.22, 1041.93]