diff --git a/exercises/B-hello-world/exercise.js b/exercises/B-hello-world/exercise.js
index b179ee953..d5a6db283 100644
--- a/exercises/B-hello-world/exercise.js
+++ b/exercises/B-hello-world/exercise.js
@@ -1 +1 @@
-console.log("Hello world");
+console.log("Hello world"); //completed check google classroom for proof
diff --git a/exercises/C-variables/exercise.js b/exercises/C-variables/exercise.js
index a6bbb9786..072ba3b45 100644
--- a/exercises/C-variables/exercise.js
+++ b/exercises/C-variables/exercise.js
@@ -1,3 +1,6 @@
-// Start by creating a variable `greeting`
+// Start by creating a variable `g
+var  greeting =  "Hello World";
 
 console.log(greeting);
+console.log(greeting);
+console.log(greeting);
diff --git a/exercises/D-strings/exercise.js b/exercises/D-strings/exercise.js
index 2cffa6a81..81270ca3c 100644
--- a/exercises/D-strings/exercise.js
+++ b/exercises/D-strings/exercise.js
@@ -1,3 +1,3 @@
 // Start by creating a variable `message`
-
-console.log(message);
+const country = "United Kindgom";
+console.log(typeof country);
diff --git a/exercises/E-strings-concatenation/exercise.js b/exercises/E-strings-concatenation/exercise.js
index 2cffa6a81..7eb4fee46 100644
--- a/exercises/E-strings-concatenation/exercise.js
+++ b/exercises/E-strings-concatenation/exercise.js
@@ -1,3 +1,5 @@
 // Start by creating a variable `message`
+const greetingStart = "Hello my name is";
+const name = "Bimbola";
 
-console.log(message);
+console.log(greetingStart + name);
diff --git a/exercises/F-strings-methods/exercise.js b/exercises/F-strings-methods/exercise.js
index 2cffa6a81..1f6d96ed9 100644
--- a/exercises/F-strings-methods/exercise.js
+++ b/exercises/F-strings-methods/exercise.js
@@ -1,3 +1,4 @@
 // Start by creating a variable `message`
+const names= "Bimbola Lasisi" ;
 
-console.log(message);
+console.log(names.length);
\ No newline at end of file
diff --git a/exercises/F-strings-methods/exercise2.js b/exercises/F-strings-methods/exercise2.js
index b4b46943d..214d7fc6f 100644
--- a/exercises/F-strings-methods/exercise2.js
+++ b/exercises/F-strings-methods/exercise2.js
@@ -1,3 +1,3 @@
-const name = " Daniel  ";
-
-console.log(message);
+const name = '    Bimbola Lasisi        ';
+name.trim();
+console.log(name);
diff --git a/exercises/G-numbers/exercise.js b/exercises/G-numbers/exercise.js
index 49e7bc00b..db61a25bd 100644
--- a/exercises/G-numbers/exercise.js
+++ b/exercises/G-numbers/exercise.js
@@ -1 +1,6 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+let numberOfStudents = 15 ;
+let numberOfMentors = 8;
+let sum = numberOfStudents + numberOfMentors;
+
+console.log('The sum of ' + numberOfStudents + ' and'  +  numberOfMentors + 'is ' + sum);
\ No newline at end of file
diff --git a/exercises/I-floats/exercise.js b/exercises/I-floats/exercise.js
index a5bbcd852..090307236 100644
--- a/exercises/I-floats/exercise.js
+++ b/exercises/I-floats/exercise.js
@@ -1,2 +1,15 @@
-var numberOfStudents = 15;
-var numberOfMentors = 8;
+let numberOfStudents = 15;
+
+ let  numberOfMentors = 8;
+
+ let total = numberOfStudents +  numberOfMentors;
+ let percentageOfStudentsCalc = (numberOfStudents / total ) * 100;
+let percentageOfMentorsCalc =(numberOfMentors / total) * 100;
+ let percentageOfStudents = Math.round(percentageOfStudentsCalc);
+let percentageOfMentors = Math.round(percentageOfMentorsCalc);
+
+console.log('Percentage students: ' +  percentageOfStudents + '%');
+console.log('Percentage mentors: ' +  percentageOfMentors + '%');
+
+
+ 
diff --git a/exercises/J-functions/exercise.js b/exercises/J-functions/exercise.js
index 0ae5850e5..02951f6c4 100644
--- a/exercises/J-functions/exercise.js
+++ b/exercises/J-functions/exercise.js
@@ -1,7 +1,14 @@
 function halve(number) {
-  // complete the function here
+    // complete the function here
+
+return  number / 2;
+
 }
 
-var result = halve(12);
+var  result = halve(12);
+var result2 = halve(24);
+
+
 
 console.log(result);
+console.log(result2);
\ No newline at end of file
diff --git a/exercises/J-functions/exercise2.js b/exercises/J-functions/exercise2.js
index 82ef5e780..48f346c55 100644
--- a/exercises/J-functions/exercise2.js
+++ b/exercises/J-functions/exercise2.js
@@ -1,7 +1,9 @@
 function triple(number) {
   // complete function here
+  return number * 3
 }
 
 var result = triple(12);
-
+var  result2 = triple(24)
 console.log(result);
+console.log(result2);
diff --git a/exercises/K-functions-parameters/exercise.js b/exercises/K-functions-parameters/exercise.js
index 8d5db5e69..5ddce24f4 100644
--- a/exercises/K-functions-parameters/exercise.js
+++ b/exercises/K-functions-parameters/exercise.js
@@ -1,6 +1,7 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(num1, numb2) {
   // Calculate the result of the function and return it
+  return num1 * numb2;
 }
 
 // Assign the result of calling the function the variable `result`
diff --git a/exercises/K-functions-parameters/exercise2.js b/exercises/K-functions-parameters/exercise2.js
index db7a8904b..35b4e000c 100644
--- a/exercises/K-functions-parameters/exercise2.js
+++ b/exercises/K-functions-parameters/exercise2.js
@@ -1,4 +1,7 @@
 // Declare your function first
+function divide (num1, num2) {
+  return num1 / num2;
+}
 
 var result = divide(3, 4);
 
diff --git a/exercises/K-functions-parameters/exercise3.js b/exercises/K-functions-parameters/exercise3.js
index 537e9f4ec..c7cb05068 100644
--- a/exercises/K-functions-parameters/exercise3.js
+++ b/exercises/K-functions-parameters/exercise3.js
@@ -1,5 +1,7 @@
 // Write your function here
-
+function createGreeting(name){
+return 'Hello, my name is ';
+}
 var greeting = createGreeting("Daniel");
 
 console.log(greeting);
diff --git a/exercises/K-functions-parameters/exercise4.js b/exercises/K-functions-parameters/exercise4.js
index 7ab44589e..5668595b5 100644
--- a/exercises/K-functions-parameters/exercise4.js
+++ b/exercises/K-functions-parameters/exercise4.js
@@ -1,5 +1,7 @@
 // Declare your function first
-
+function add(num1, num2) {
+return num1 + num2;
 // Call the function and assign to a variable `sum`
-
+}
+var sum = add (13, 124);
 console.log(sum);
diff --git a/exercises/K-functions-parameters/exercise5.js b/exercises/K-functions-parameters/exercise5.js
index 7c5bcd605..0625b893f 100644
--- a/exercises/K-functions-parameters/exercise5.js
+++ b/exercises/K-functions-parameters/exercise5.js
@@ -1,5 +1,10 @@
 // Declare your function here
+function createLongGreeting(name, age) {
+
+    return 'Hello, my name is ${name} and i am   ${age} years old';
+}
+
+    const greeting = createLongGreeting("Daniel", 30);
 
-const greeting = createLongGreeting("Daniel", 30);
 
 console.log(greeting);
diff --git a/exercises/L-functions-nested/exercise.js b/exercises/L-functions-nested/exercise.js
index a5d377442..d2a3988cd 100644
--- a/exercises/L-functions-nested/exercise.js
+++ b/exercises/L-functions-nested/exercise.js
@@ -1,5 +1,13 @@
-var mentor1 = "Daniel";
-var mentor2 = "Irina";
-var mentor3 = "Mimi";
-var mentor4 = "Rob";
-var mentor5 = "Yohannes";
+function shoutyGreeting(mentor){
+}
+let mentor1 = "Daniel";
+let mentor2 = "Irina";
+let mentor3 = "Mimi";
+let mentor4 = "Rob";
+let  mentor5 = "Yohannes";
+
+console.log(mentor1.toUpperCase());
+console.log(mentor2.toUpperCase());
+console.log(mentor3.toUpperCase());
+console.log(mentor4.toUpperCase());
+console.log(mentor5.toUpperCase());
\ No newline at end of file
diff --git a/extra/1-currency-conversion.js b/extra/1-currency-conversion.js
index d82e59480..4d9e3e6bf 100644
--- a/extra/1-currency-conversion.js
+++ b/extra/1-currency-conversion.js
@@ -5,8 +5,13 @@
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
 
-function convertToUSD() {}
+function convertToUSD(amountToPounds) {
+ return  amountToPounds * 1.4 ;
 
+}
+
+let value = convertToUSD(30);
+console.log(value);
 /*
   CURRENCY CONVERSION
   ===================
@@ -15,7 +20,13 @@ function convertToUSD() {}
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
 
-function convertToBRL() {}
+function convertToBRL(amountInBrl) {
+let  exchangeRate = amountInBrl - (0.01 * amountInBrl);
+return Math.round(exchangeRate * 5.7)  / 100;
+}
+let value2 = convertToBRL(30);
+console.log (value2);
+
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/2-piping.js b/extra/2-piping.js
index 9c8ebc76a..37ca6bff5 100644
--- a/extra/2-piping.js
+++ b/extra/2-piping.js
@@ -16,26 +16,31 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(num1 , num2) {
+ return num1 + num2;
 }
+console.log(add (3, 5));
 
 function multiply() {
-
+   return num1 * numb2;
 }
+console.log(multiply (3, 5));
 
-function format() {
-
+function format(pound) {
+return  pound ;
 }
 
 const startingValue = 2;
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
-
+let badCode = 0; 
+//let code = newDate(2021, 7, 7)) return newDate:  bad code because  all togther in one line 
 /* BETTER PRACTICE */
 
-let goodCode =
+let goodCode = 0;
+// goodCode =newDate(2021, 7, 06);
+// return newDate;
+// best practices 
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
diff --git a/extra/3-magic-8-ball.js b/extra/3-magic-8-ball.js
index f3adbefa5..a04437f70 100644
--- a/extra/3-magic-8-ball.js
+++ b/extra/3-magic-8-ball.js
@@ -43,10 +43,124 @@
     Very doubtful.
 */
 
-// This should log "The ball has shaken!"
+
+
 // and return the answer.
-function shakeBall() {
+let answer =[
+  {
+    positivity: " It is certain.",
+    type: " very positive"
+  },
+{
+  
+  positivity: " It is decidedly so.",
+  type: " very positive"
+},
+{
+
+  positivity: " Without a doubt.",
+  type: " very positive"
+},
+{
+
+   positivity: " Yes - definitely.",
+  type: " very positive"
+},
+{
+
+ positivity: " Yes - definitely.",
+  type: " very positive"
+},
+{
+
+   positivity: " you may rely on it ",
+  type: " very positive"
+},
+{
+
+   positivity: " As I see it, yes.",
+  type: " positive"
+},
+{
+
+   positivity: " Most likely.",
+  type: " positive"
+},
+{
+
+   positivity: " Outlook good.",
+  type: "positive"
+},
+{
+
+   positivity: " Yes.",
+  type: " positive"
+},
+{
+
+
+   positivity: " Sign point to yes.",
+  type: " positive"
+},
+{
+
+   negativity: "  Reply hazy, try again",
+  type: " negative"
+},
+{
+
+   negativity: " Ask again later.",
+  type: " negative"
+},
+{
+
+   negativity: " Better not tell you now.",
+  type: " negative"
+},
+{
+
+   negativity: " Cannot predict now.",
+  type: " negative"
+},
+{
+   negativity: " Concentrate and ask again.",
+  type: " negative"
+},
+{
+
+   negativity: " Don't count on it.",
+  type: " very negative"
+},
+{
+
+   negativity: "My reply is no.",
+  type: " very negative"
+},
+{
+
+   negativity: " My sources say no.",
+  type: " very negative"
+},
+{
+
+   negativity: " Outlook not so good.",
+  type: " very negative"
+},
+{
+
+  negativity: " Very doubtful .",
+  type: " very negative"
+},
+]
+
+
+
   //Write your code in here
+function shakeBall() {
+  let randomAnswer = Math.floor(maths.random() * 20);
+  // This should log "The ball has shaken!"
+  console.log("The ball has shaken!")
+  return answer[randomAnswer].positivity;
 }
 
 /* 
@@ -60,8 +174,36 @@ function shakeBall() {
 */
 function checkAnswer(answer) {
   //Write your code in here
-}
+  let  checkAnswer= math.floor(math.randomAnswer() *20)
+    if (randomAnswer === 20){
+    console.log("it is certain")
+    }else if (randomAnswer === 19){
+    console.log('Reply hazy, try again')
+    }else if (randomAnswer===18 ){
+    console.log('It is decidedly so.')
+    }else if (randomAnswer===17 ){
+    console.log('Without a doubt.')
+    }else if (randomAnswer===16 ){
+    console.log('yes -Definitely.')
+    }else if (randomAnswer===17 ){
+    console.log('You may rely rely on it.')
+    }else if (randomAnswer===15 ){
+    console.log('Most likely.')
+    }else if (randomAnswer===14 ){
+    console.log('It is decidedly so.')
+    }else if (randomAnswer===14 ){
+    console.log('out look good.')
+    }else if (randomAnswer===13 ){
+    console.log('yes.')
+    }else if (randomAnswer===12 ){
+    console.log('Sign point to yes.')
 
+    }else if (randomAnswer===0 ){
+    console.log('very doubtful .')
+    }else if (randomAnswer===11 ){
+    console.log('Reply hazy, try later.')
+ }
+}
 /* 
 ==================================
 ======= TESTS - DO NOT MODIFY =====
diff --git a/mandatory/1-syntax-errors.js b/mandatory/1-syntax-errors.js
index a10cc9ac2..12f3e2f48 100644
--- a/mandatory/1-syntax-errors.js
+++ b/mandatory/1-syntax-errors.js
@@ -1,18 +1,18 @@
 // There are syntax errors in this code - can you fix it to pass the tests?
 
-function addNumbers(a b c) {
+function addNumbers(a, b, c) {
   return a + b + c;
 }
 
-function introduceMe(name, age)
-  return "Hello, my name is " + name "and I am " age + "years old";
-
+function introduceMe(name, age) {
+  return "Hello, my name is " + name + " and I am " + age + " years old";
+}
 function getTotal(a, b) {
-  total = a ++ b;
+  let total = a + b;
 
-  return "The total is total";
-}
+  return "The total is " + total;
 
+}
 /* 
 ===================================================
 ======= TESTS - DO NOT MODIFY BELOW THIS LINE =====
diff --git a/mandatory/2-logic-error.js b/mandatory/2-logic-error.js
index 9cca7603b..708112757 100644
--- a/mandatory/2-logic-error.js
+++ b/mandatory/2-logic-error.js
@@ -1,16 +1,16 @@
 // The syntax for this function is valid but it has an error, find it and fix it.
 
 function trimWord(word) {
-  return wordtrim();
+  return word.trim();
 }
 
 function getStringLength(word) {
-  return "word".length();
+  return word.length;
 }
 
 function multiply(a, b, c) {
-  a * b * c;
-  return;
+  let  result = a * b * c;
+  return (result);
 }
 
 /* 
diff --git a/mandatory/3-function-output.js b/mandatory/3-function-output.js
index 5a953ba60..cf811e59e 100644
--- a/mandatory/3-function-output.js
+++ b/mandatory/3-function-output.js
@@ -1,16 +1,18 @@
 // Add comments to explain what this function does. You're meant to use Google!
 function getRandomNumber() {
-  return Math.random() * 10;
+  return Math.random() * 10;  // getNumber function  return using math.random method
 }
 
 // Add comments to explain what this function does. You're meant to use Google!
 function combine2Words(word1, word2) {
-  return word1.concat(word2);
+  return word1.concat(word2); // combine2word function return by joining word1 and word 2 together 
 }
 
 function concatenate(firstWord, secondWord, thirdWord) {
+  
   // Write the body of this function to concatenate three words together.
   // Look at the test case below to understand what this function is expected to return.
+  return firstWord.concat( " ",secondWord, " ",thirdWord);
 }
 
 /* 
diff --git a/mandatory/4-tax.js b/mandatory/4-tax.js
index ba77c7ae2..0ad900804 100644
--- a/mandatory/4-tax.js
+++ b/mandatory/4-tax.js
@@ -5,7 +5,11 @@
   Sales tax is 20% of the price of the product.
 */
 
-function calculateSalesTax() {}
+function calculateSalesTax(price) {
+let taxPercentages = price * (20 / 100) ;
+return  taxPercentages + price ;
+}
+
 
 /*
   CURRENCY FORMATTING
@@ -17,7 +21,12 @@ function calculateSalesTax() {}
   Remember that the prices must include the sales tax (hint: you already wrote a function for this!)
 */
 
-function addTaxAndFormatCurrency() {}
+function addTaxAndFormatCurrency(price) {
+let taxPercentages = "£" + (price/100);
+return  formattedPrice;
+}
+let result2 = addTaxAndFormatCurrency(20) ;
+
 
 /* 
 ===================================================
diff --git a/package.json b/package.json
index 58555936d..778df9683 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,9 @@
     "url": "https://github.com/CodeYourFuture/JavaScript-Core-1-Coursework-Week1/issues"
   },
   "jest": {
-    "setupFilesAfterEnv": ["jest-extended"]
+    "setupFilesAfterEnv": [
+      "jest-extended"
+    ]
   },
   "homepage": "https://github.com/CodeYourFuture/JavaScript-Core-1-Coursework-Week1#readme",
   "devDependencies": {