diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..5e6af88a 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -12,6 +12,7 @@
 // Example 1
 let a;
 console.log(a);
+// the reason why we are seeing undefined for a has no value assigned
 
 
 // Example 2
@@ -21,12 +22,15 @@ function sayHello() {
 
 let hello = sayHello();
 console.log(hello);
+// the function is undefined because it has not returned anything
+
 
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
+// the user parameter does not pass anything
 
 sayHelloToUser();
 
@@ -34,3 +38,5 @@ sayHelloToUser();
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+// there is no index 3 in the array the index goes up to 2
+
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
index b459888f..f7d7e86b 100644
--- a/1-exercises/B-while-loop/exercise.js
+++ b/1-exercises/B-while-loop/exercise.js
@@ -7,6 +7,14 @@
 
 function evenNumbers(n) {
     // TODO
+    const arr = []
+    let i = 0
+
+    while (i < n) {
+        arr.push(i * 2);
+        i++;
+    }
+    console.log(arr.join(', '));
 }
 
 evenNumbers(3); // should output 0,2,4
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
index d584cd75..9d08be2f 100644
--- a/1-exercises/C-while-loop-with-array/exercise.js
+++ b/1-exercises/C-while-loop-with-array/exercise.js
@@ -17,6 +17,15 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
+    let i = 0;
+
+    while (i < birthdays.length - 1) {
+        let birthdayCheck = birthdays[i];
+        if (birthdayCheck.startsWith("July")) {
+            return birthdayCheck;
+        }
+        i++;
+    }
     // TODO
 }
 
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
index f10d0764..a5371bcf 100644
--- a/1-exercises/D-do-while/exercise.js
+++ b/1-exercises/D-do-while/exercise.js
@@ -8,6 +8,17 @@
 
 function evenNumbersSum(n) {
     // TODO
+    if (n == 0) return 0
+    let i = 0
+    j = 1
+    sum = 0
+    do {
+        i += 2
+        sum += i
+        j++
+    }
+    while (j < 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..1f81ac9d 100644
--- a/1-exercises/E-for-loop/exercise1.js
+++ b/1-exercises/E-for-loop/exercise1.js
@@ -6,9 +6,7 @@
 
 
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
+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..0561c380 100644
--- a/1-exercises/E-for-loop/exercise2.js
+++ b/1-exercises/E-for-loop/exercise2.js
@@ -27,6 +27,9 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
+for (let 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..6550b072 100644
--- a/1-exercises/F-for-of-loop/exercise.js
+++ b/1-exercises/F-for-of-loop/exercise.js
@@ -14,3 +14,13 @@ let tubeStations = [
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (let i = 0; i < tubeStations.length; i++) {
+    const index = tubeStations[i];
+    console.log(index);
+}
+let capture = ""
+for (let i = 0; i < str.length;  i++) {
+capture += str[i];
+}
+console.log(capture.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..e5d1c1ff 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -13,8 +13,12 @@
 
 function getTemperatureReport(cities) {
     // TODO
+let temperature = [];
+for (let i = 0; i < cities.length; i++) {
+    tem.push(`The temperature in ${cities[i]} is ${temperatureService(cities[i])} degrees`);
+}
+return temperature;
 }
-
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
index 10aab37d..c9f21eb2 100644
--- a/2-mandatory/2-retrying-random-numbers.js
+++ b/2-mandatory/2-retrying-random-numbers.js
@@ -11,7 +11,11 @@ function generateRandomNumber() {
 
 function getRandomNumberGreaterThan50() {
     // TODO - implement using a do-while loop
-}
+    i = 0;
+    do {
+      i += generateRandomNumber();
+    } while (i < 50);
+    return i;}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/3-financial-times.js b/2-mandatory/3-financial-times.js
index 2ce6fb73..f4e8ccd7 100644
--- a/2-mandatory/3-financial-times.js
+++ b/2-mandatory/3-financial-times.js
@@ -6,6 +6,8 @@
 */
 function potentialHeadlines(allArticleTitles) {
     // TODO
+    const article = allArticleTitles.filter((article) => article.length <= 65);
+    return article;
 }
 
 /*
@@ -15,8 +17,17 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    const outputOfArticle = allArticleTitles[0];
+  for (let i = 0; i < allArticleTitles.length; i++) {
+    if (
+      allArticleTitles[i].split(" ").length < outputOfArticle.split(" ").length
+    )
+      outputOfArticle = allArticleTitles[i];
+  }
+  return outputOfArticle;
 }
 
+
 /*
     The editor of the FT has realised that headlines which have numbers in them get more clicks!
     Implement the function below to return a new array containing all the headlines which contain a number.
@@ -24,6 +35,8 @@ function titleWithFewestWords(allArticleTitles) {
 */
 function headlinesWithNumbers(allArticleTitles) {
     // TODO
+    const title = allArticleTitles.filter((article) => article.match(/(\d+)/));
+    return title
 }
 
 /*
@@ -32,6 +45,12 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    const total = 0;
+    for (let title of allArticleTitles) {
+      total += title.length;
+    }
+    let average = total / allArticleTitles.length;
+    return Math.round(average);
 }
 
 
diff --git a/2-mandatory/4-stocks.js b/2-mandatory/4-stocks.js
index 72d62f94..73465f46 100644
--- a/2-mandatory/4-stocks.js
+++ b/2-mandatory/4-stocks.js
@@ -35,6 +35,11 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
 */
 function getAveragePrices(closingPricesForAllStocks) {
     // TODO
+    return closingPricesForAllStocks.map((priceArr) => {
+        return Number(
+          (priceArr.reduce((tot, num) => tot + num) / priceArr.length).toFixed(2)
+        );
+      });
 }
 
 /*
@@ -49,6 +54,9 @@ function getAveragePrices(closingPricesForAllStocks) {
 */
 function getPriceChanges(closingPricesForAllStocks) {
     // TODO
+    return closingPricesForAllStocks.map((priceArr) => {
+        return Number((priceArr[priceArr.length - 1] - priceArr[0]).toFixed(2));
+      });
 }
 
 /*
@@ -65,6 +73,13 @@ function getPriceChanges(closingPricesForAllStocks) {
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
     // TODO
+    let highestPriceDescriptions = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+       highestPriceDescriptions.push(`The highest price of ${stocks[i].toUpperCase()} in the last 5 days was ${Math.max(...closingPricesForAllStocks[i]
+     ).toFixed(2)}`
+        );
+    }
+    return highestPriceDescriptions;
 }