diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
index 0acfc78d..348a0081 100644
--- a/1-exercises/A-undefined/exercise.js
+++ b/1-exercises/A-undefined/exercise.js
@@ -1,7 +1,7 @@
 /*
     By now, you would have already seen "undefined", either in an error message or being output from your program.
     But what does it mean? undefined represents the absence of a value.
-    
+
     In some cases, undefined will be used by a programmer intentionally, and they will write code to handle it.
     But usually, when you see undefined - it means something has gone wrong!
 
@@ -12,25 +12,28 @@
 // Example 1
 let a;
 console.log(a);
-
+/*we saw undefine output because we declared variable and
+ we didn't assign any value ,that's mean nothing to display.*/
 
 // Example 2
 function sayHello() {
     let message = "Hello";
-}
 
+}
 let hello = sayHello();
 console.log(hello);
-
+/* we saw undefine output because function doesn't return or output anything*/
 
 // Example 3
 function sayHelloToUser(user) {
     console.log(`Hello ${user}`);
 }
-
 sayHelloToUser();
+/* we saw undefine output because we didn't assign any value for the variable 'user'
+that's mean the variable is empty*/
 
 
 // Example 4
 let arr = [1,2,3];
 console.log(arr[3]);
+/*we saw undefine we don't have index[3] in the array */
\ No newline at end of file
diff --git a/1-exercises/B-array-literals/exercise.js b/1-exercises/B-array-literals/exercise.js
index 51eba5cc..1b457b0c 100644
--- a/1-exercises/B-array-literals/exercise.js
+++ b/1-exercises/B-array-literals/exercise.js
@@ -4,16 +4,16 @@
   Declare some variables assigned to arrays of values
 */
 
-let numbers = []; // add numbers from 1 to 10 into this array
-let mentors; // Create an array with the names of the mentors: Daniel, Irina and Rares
+let numbers = [1,2,3,4,5,6,7,8,9,10]; // add numbers from 1 to 10 into this array
+let mentors =['Daniel', 'Irina', 'Rares']; // Create an array with the names of the mentors: Daniel, Irina and Rares
 
-/* 
+/*
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */
 console.log(numbers);
 console.log(mentors);
 
-/* 
+/*
   EXPECTED RESULT
   ---------------
   [1,2,3,4,5,6,7,8,9,10]
diff --git a/1-exercises/C-array-get-set/exercise.js b/1-exercises/C-array-get-set/exercise.js
index 5ca911d5..e5003bcf 100644
--- a/1-exercises/C-array-get-set/exercise.js
+++ b/1-exercises/C-array-get-set/exercise.js
@@ -5,14 +5,14 @@
 */
 
 function first(arr) {
-  return; // complete this statement
+  return arr[0]; // complete this statement
 }
 
 function last(arr) {
-  return; // complete this statement
+  return arr[arr.length-1]; // complete this statement
 }
 
-/* 
+/*
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */
 let numbers = [1, 2, 3];
@@ -22,7 +22,7 @@ console.log(first(numbers));
 console.log(last(numbers));
 console.log(last(names));
 
-/* 
+/*
   EXPECTED RESULT
   ---------------
   1
diff --git a/1-exercises/C-array-get-set/exercises2.js b/1-exercises/C-array-get-set/exercises2.js
index 6b6b007a..aca3ba5d 100644
--- a/1-exercises/C-array-get-set/exercises2.js
+++ b/1-exercises/C-array-get-set/exercises2.js
@@ -7,13 +7,13 @@
 */
 
 let numbers = [1, 2, 3]; // Don't change this array literal declaration
-
-/* 
+  numbers.push(4)
+/*
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */
 console.log(numbers);
 
-/* 
+/*
   EXPECTED RESULT
   ---------------
   [1, 2, 3, 4]
diff --git a/1-exercises/D-for-loop/exercise.js b/1-exercises/D-for-loop/exercise.js
index 081002b2..96b9ea28 100644
--- a/1-exercises/D-for-loop/exercise.js
+++ b/1-exercises/D-for-loop/exercise.js
@@ -27,7 +27,9 @@ const AGES = [
 ];
 
 // TODO - Write for loop code here
-
+for(let i=0 ;i<AGES.length && i<WRITERS.length; i++){
+    console.log(`${WRITERS[i]} is ,${AGES[i]} old`);
+}
 /*
 The output should look something like this:
 
diff --git a/1-exercises/E-while-loop-with-array/exercise.js b/1-exercises/E-while-loop-with-array/exercise.js
index d584cd75..c0934ad5 100644
--- a/1-exercises/E-while-loop-with-array/exercise.js
+++ b/1-exercises/E-while-loop-with-array/exercise.js
@@ -17,7 +17,18 @@ const BIRTHDAYS = [
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
-}
+    let firstJulyBDay = null;
+    let count=0;
+    while(count <birthdays.length){
+        if(birthdays[count] === "July 11th"){
+            firstJulyBDay = birthdays[count];
+        }
+        count++;
+        }
+        return firstJulyBDay;
+
+    }
+
+
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
index dcc2bdb0..4e0ce9e5 100644
--- a/2-mandatory/1-weather-report.js
+++ b/2-mandatory/1-weather-report.js
@@ -1,6 +1,6 @@
 /*
     Imagine we're making a weather app!
-    
+
     We have a list of cities that the user wants to track.
     We also already have a temperatureService function which will take a city as a parameter and return a temparature.
 
@@ -12,8 +12,11 @@
 */
 
 function getTemperatureReport(cities) {
-    // TODO
-}
+ return cities.map((city)=>`The temperature in ${city} is ${temperatureService(city)} degrees`);
+
+    }
+
+
 
 
 /* ======= TESTS - DO NOT MODIFY ===== */
@@ -28,10 +31,13 @@ function temperatureService(city) {
     temparatureMap.set('Mumbai', 29);
     temparatureMap.set('São Paulo', 23);
     temparatureMap.set('Lagos', 33);
-    
+
     return temparatureMap.get(city);
 }
-
+test('should return array of same length as argument',()=>{
+    let usersCities = ['London', 'Paris', 'Barcelona'];
+    expect(getTemperatureReport(usersCities).length).toEqual(3);
+})
 test("should return a temperature report for the user's cities", () => {
     let usersCities = [
         "London",
diff --git a/2-mandatory/2-financial-times.js b/2-mandatory/2-financial-times.js
index 2ce6fb73..978cea2f 100644
--- a/2-mandatory/2-financial-times.js
+++ b/2-mandatory/2-financial-times.js
@@ -5,7 +5,14 @@
     Implement the function below, which will return a new array containing only article titles which will fit.
 */
 function potentialHeadlines(allArticleTitles) {
+    let titles=[];
+    for (let i=0; i<allArticleTitles.length; i++) {
+        if (allArticleTitles[i].length <= 65) {
+            titles.push (allArticleTitles[i]);
+    }
     // TODO
+    }
+    return titles;
 }
 
 /*
@@ -15,6 +22,16 @@ function potentialHeadlines(allArticleTitles) {
 */
 function titleWithFewestWords(allArticleTitles) {
     // TODO
+    let fewestWords =Infinity;
+    let title='';
+    for(let i=0; i < allArticleTitles.length; i++){
+        let words = allArticleTitles[i].split(" ");
+        if(words.length < fewestWords){
+            fewestWords = words.length;
+            title = allArticleTitles[i];
+        }
+    }
+    return title;
 }
 
 /*
@@ -22,9 +39,20 @@ function titleWithFewestWords(allArticleTitles) {
     Implement the function below to return a new array containing all the headlines which contain a number.
     (Hint: remember that you can also loop through the characters of a string if you need to)
 */
+
 function headlinesWithNumbers(allArticleTitles) {
-    // TODO
-}
+    let headlines = [];
+    for (let i = 0; i < allArticleTitles.length; i++) {
+      if (/\d/.test(allArticleTitles[i])) {
+        headlines.push(allArticleTitles[i]);
+      }
+    }
+    return headlines;
+  }
+
+
+
+
 
 /*
     The Financial Times wants to understand what the average number of characters in an article title is.
@@ -32,6 +60,13 @@ function headlinesWithNumbers(allArticleTitles) {
 */
 function averageNumberOfCharacters(allArticleTitles) {
     // TODO
+    let totalChars = 0;
+    for(let i=0 ; i < allArticleTitles.length; i++){
+        totalChars += allArticleTitles[i].length
+    }
+
+    let average = totalChars / allArticleTitles.length;
+    return  Math.round(average);
 }
 
 
diff --git a/2-mandatory/3-stocks.js b/2-mandatory/3-stocks.js
index 72d62f94..5e045016 100644
--- a/2-mandatory/3-stocks.js
+++ b/2-mandatory/3-stocks.js
@@ -22,7 +22,7 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
     We want to understand what the average price over the last 5 days for each stock is.
     Implement the below function, which
         - Takes this CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS array as input (remember, it's an array of arrays)
-        - Returns an array containing the average price over the last 5 days for each stock. 
+        - Returns an array containing the average price over the last 5 days for each stock.
             For example, the first element of the resulting array should contain Apple’s (aapl) average stock price for the last 5 days.
             The second element should be Microsoft's (msft) average price, and so on.
     The average value should be rounded to 2 decimal places, and should be a number (not a string)
@@ -34,8 +34,24 @@ const CLOSING_PRICES_LAST_5_DAYS_FOR_ALL_STOCKS = [
         Functions can help with this!
 */
 function getAveragePrices(closingPricesForAllStocks) {
-    // TODO
+
+    let days = 5;
+    let averagePrice = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let total =0;
+        for (let j = 0; j < days; j++) {
+            total += closingPricesForAllStocks[i][j];
+          }
+
+          let avg = total / days;
+          avg = Math.round(avg * 100) / 100;
+        averagePrice.push(avg);
+    }
+    return averagePrice;
+
 }
+    // TODO
+
 
 /*
     We also want to see what the change in price is from the first day to the last day for each stock.
@@ -48,9 +64,17 @@ 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 days = 5;
+    let priceChanges = [];
+    for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+        let priceChange = closingPricesForAllStocks[i][days - 1] - closingPricesForAllStocks[i][0];
+        priceChange = Math.round(priceChange * 100) / 100;
+        priceChanges.push(priceChange);
+    }
+    return priceChanges;
 }
 
+
 /*
     As part of a financial report, we want to see what the highest price was for each stock in the last 5 days.
     Implement the below function, which
@@ -64,6 +88,22 @@ function getPriceChanges(closingPricesForAllStocks) {
     The price should be shown with exactly 2 decimal places.
 */
 function highestPriceDescriptions(closingPricesForAllStocks, stocks) {
+ let descriptions = [];
+ for (let i = 0; i < closingPricesForAllStocks.length; i++) {
+    let highest = Math.max(...closingPricesForAllStocks[i]);
+    let stockTicker = stocks[i].toUpperCase();
+    let description = `The highest price of ${stockTicker} in the last 5 days was ${highest.toFixed(2)}`;
+    descriptions.push(description);
+
+
+ }
+ return descriptions;
+
+
+
+
+
+
     // TODO
 }