diff --git a/1-exercises/A-array-find/exercise.js b/1-exercises/A-array-find/exercise.js
index 35902fed..3eb6a776 100644
--- a/1-exercises/A-array-find/exercise.js
+++ b/1-exercises/A-array-find/exercise.js
@@ -5,6 +5,7 @@
 
 // write your code here
 
+
 let names = [
   "Rakesh",
   "Antonio",
@@ -17,6 +18,14 @@ let names = [
   "Ahmed",
 ];
 
+function isLongNameAndStartsWithA(name) {
+  return name.length > 7 && name[0] == "A";
+}
+function findLongNameThatStartsWithA(names){
+  return names.find(isLongNameAndStartsWithA);
+
+}
+
 let longNameThatStartsWithA = findLongNameThatStartsWithA(names);
 
 console.log(longNameThatStartsWithA);
diff --git a/1-exercises/B-array-some/exercise.js b/1-exercises/B-array-some/exercise.js
index fddc69ee..7d9b9e08 100644
--- a/1-exercises/B-array-some/exercise.js
+++ b/1-exercises/B-array-some/exercise.js
@@ -8,10 +8,19 @@
 
 let pairsByIndex = [[0, 3], [1, 2], [2, 1], null, [3, 0]];
 
+//***************************************************
+
+function isNullvalue(!number) {
+  return !number;
+}
+
+//***************************************************
+
 // If there is a null value in the array exit the program with the error code
 // https://nodejs.org/api/process.html#process_process_exit_code
 // process.exit(1);
 
+
 let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];
 
diff --git a/1-exercises/C-array-every/exercise.js b/1-exercises/C-array-every/exercise.js
index 347b9632..cb22040d 100644
--- a/1-exercises/C-array-every/exercise.js
+++ b/1-exercises/C-array-every/exercise.js
@@ -5,7 +5,11 @@
 let students = ["Omar", "Austine", "Dany", "Swathi", "Lesley", "Rukmini"];
 let group = ["Austine", "Dany", "Swathi", "Daniel"];
 
-let groupIsOnlyStudents; // complete this statement
+let groupIsOnlyStudents = group.every(students);{
+return students.includes(students);
+}
+console.log(groupIsOnlyStudents);
+
 
 if (groupIsOnlyStudents) {
   console.log("The group contains only students");
diff --git a/1-exercises/D-array-filter/exercise.js b/1-exercises/D-array-filter/exercise.js
index 51837028..bb3139e8 100644
--- a/1-exercises/D-array-filter/exercise.js
+++ b/1-exercises/D-array-filter/exercise.js
@@ -8,7 +8,10 @@
 
 let pairsByIndexRaw = [[0, 3], [1, 2], [2, 1], null, [1], false, "whoops"];
 
-let pairsByIndex; // Complete this statement
+let pairsByIndex = pairsByIndexRaw.filter( item => item.length === 2);
+
+
+// Complete this statement
 
 let students = ["Islam", "Lesley", "Harun", "Rukmini"];
 let mentors = ["Daniel", "Irina", "Mozafar", "Luke"];
diff --git a/1-exercises/E-array-map/exercise.js b/1-exercises/E-array-map/exercise.js
index 5a157279..b5ba4a35 100644
--- a/1-exercises/E-array-map/exercise.js
+++ b/1-exercises/E-array-map/exercise.js
@@ -3,7 +3,7 @@
 
 let numbers = [0.1, 0.2, 0.3, 0.4, 0.5];
 
-let numbersMultipliedByOneHundred; // complete this statement
+let numbersMultipliedByOneHundred = numbers.map(number => number * 100); // complete this statement
 
 console.log(numbersMultipliedByOneHundred);
 
diff --git a/1-exercises/G-array-methods/exercise.js b/1-exercises/G-array-methods/exercise.js
index 4367ef6e..bc504f2a 100644
--- a/1-exercises/G-array-methods/exercise.js
+++ b/1-exercises/G-array-methods/exercise.js
@@ -4,7 +4,7 @@
 */
 
 let numbers = [3, 2, 1];
-let sortedNumbers; // complete this statement
+let sortedNumbers = numbers.sort(); // complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE
diff --git a/1-exercises/G-array-methods/exercise2.js b/1-exercises/G-array-methods/exercise2.js
index 4c68c3a6..66d9b1ab 100644
--- a/1-exercises/G-array-methods/exercise2.js
+++ b/1-exercises/G-array-methods/exercise2.js
@@ -7,8 +7,7 @@
 let mentors = ["Daniel", "Irina", "Rares"];
 let students = ["Rukmini", "Abdul", "Austine", "Swathi"];
 
-let everyone; // complete this statement
-
+let everyone = mentors.concat(students);
 /* 
   DO NOT EDIT BELOW THIS LINE
   --------------------------- */
diff --git a/1-exercises/H-array-methods-2/exercise.js b/1-exercises/H-array-methods-2/exercise.js
index 59c5daa7..cab72be3 100644
--- a/1-exercises/H-array-methods-2/exercise.js
+++ b/1-exercises/H-array-methods-2/exercise.js
@@ -15,8 +15,8 @@ let everyone = [
   "Swathi",
 ];
 
-let firstFive; // complete this statement
-let lastFive; // complete this statement
+let firstFive = everyone.slice(0, 5);// complete this statement
+let lastFive = everyone.slice(2, 7);// complete this statement
 
 /* 
   DO NOT EDIT BELOW THIS LINE
diff --git a/1-exercises/H-array-methods-2/exercise2.js b/1-exercises/H-array-methods-2/exercise2.js
index 14bb4318..aec63046 100644
--- a/1-exercises/H-array-methods-2/exercise2.js
+++ b/1-exercises/H-array-methods-2/exercise2.js
@@ -6,8 +6,16 @@
   For example, capitailise("hello") should return "Hello"
   Tip: use the string method .split() and the array method .join()
 */
+//******
+//originanl: 
+//function capitalise(str) {}
+//*******
 
-function capitalise(str) {}
+function capitalise(str){
+let uppercase = str.split("");
+uppercase[0] = uppercase[0].toUpperCase();
+return uppercase.join("");
+}
 
 /* 
   DO NOT EDIT BELOW THIS LINE
diff --git a/1-exercises/H-array-methods-2/exercise3.js b/1-exercises/H-array-methods-2/exercise3.js
index c8e079e4..7279417e 100644
--- a/1-exercises/H-array-methods-2/exercise3.js
+++ b/1-exercises/H-array-methods-2/exercise3.js
@@ -7,7 +7,7 @@
 let ukNations = ["Scotland", "Wales", "England", "Northern Ireland"];
 
 function isInUK(country) {
-  return; // complete this statement
+  return ukNations.includes(country); // complete this statement
 }
 
 /* 
diff --git a/1-exercises/I-string-replace/exercise.js b/1-exercises/I-string-replace/exercise.js
index 3f7104d7..bbc425e3 100644
--- a/1-exercises/I-string-replace/exercise.js
+++ b/1-exercises/I-string-replace/exercise.js
@@ -13,7 +13,8 @@
 let story =
   "I like dogs. One day I went to the park and I saw 10 dogs. It was a great day.";
 
-let result = story.replace("", "");
+let result = story.replace("dogs");
+console.log(result);
 
 /* EXPECTED OUTPUT */
 
diff --git a/1-exercises/J-string-substring/exercise.js b/1-exercises/J-string-substring/exercise.js
index 4624db68..073380a6 100644
--- a/1-exercises/J-string-substring/exercise.js
+++ b/1-exercises/J-string-substring/exercise.js
@@ -6,9 +6,9 @@
 
 let statement = "I like programming and dogs";
 
-statement = statement.substring();
+let newStatement = statement.substring(0, 19);
 
-console.log(statement);
+console.log(newStatement);
 
 /* EXPECTED OUTPUT 
 
diff --git a/1-exercises/J-string-substring/exercise2.js b/1-exercises/J-string-substring/exercise2.js
index a1d9bf62..ea13ad22 100644
--- a/1-exercises/J-string-substring/exercise2.js
+++ b/1-exercises/J-string-substring/exercise2.js
@@ -3,7 +3,9 @@
 
   You should log only the peoples first names.
 
-  For example, if the name is "John Smith" you should return "John"
+  For example, if the name is "John Smith" you 
+  
+  should return "John"
 */
 
 let names = [
@@ -14,11 +16,11 @@ let names = [
   "Arron Graham",
 ];
 
-names[0] = names[0].substring();
-names[1] = names[1].substring();
-names[2] = names[2].substring();
-names[3] = names[3].substring();
-names[4] = names[4].substring();
+names[0] = names[0].substring(0, 6);
+names[1] = names[1].substring(0, 6);
+names[2] = names[2].substring(0, 5);
+names[3] = names[3].substring(0, 5);
+names[4] = names[4].substring(0, 5);
 
 names.forEach((name) => {
   console.log(name);
diff --git a/1-exercises/J-string-substring/exercise3.js b/1-exercises/J-string-substring/exercise3.js
index 14f77417..01d95088 100644
--- a/1-exercises/J-string-substring/exercise3.js
+++ b/1-exercises/J-string-substring/exercise3.js
@@ -8,7 +8,7 @@
 
 let statement = "I do not like programming";
 
-let result = "";
+let result = statement.substring(0, 4)+statement.substring(8, statement.length);
 
 console.log(result);
 
diff --git a/2-mandatory/1-create-functions.js b/2-mandatory/1-create-functions.js
index 6df12961..281a6854 100644
--- a/2-mandatory/1-create-functions.js
+++ b/2-mandatory/1-create-functions.js
@@ -3,7 +3,11 @@ Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the first five elements of the passed array.
 */
-function first5() {
+
+//let first5 = groceries.slice(0,5);
+
+function first5(item) {
+  return item.slice(0, 5);
 }
 
 /*
@@ -11,7 +15,9 @@ Write a function that:
 - Accepts an array as a parameter.
 - Returns a new array containing the same elements, except sorted.
 */
-function sortArray() {
+function sortArray(array) {
+  const newArr = array.filter((e) => e).sort();
+  return newArr;
 }
 
 /*
@@ -19,12 +25,22 @@ NOTE: This exercise is the same as one you did last week - try to do it again us
 Think about what is better about this solution than your one last week, and what is worse.
 
 Write a function that:
-- Takes an array of strings as input.
+- Takes an array of strings as input.✔
 - Removes any spaces in the beginning or end each string.
 - Removes any forward slashes (/) in the strings.
 - Makes the strings all lowercase.
 */
-function tidyUpString() {
+
+function tidyUpString(strings) {
+  const arr = [];
+   for (let i = 0; i < strings.length; i += 1) {
+    const string = strings[i];
+   arr.push(string
+   .trim()
+   .replace("/", '')
+   .toLowerCase());
+   }
+   return arr;
 }
 
 /*
@@ -33,7 +49,8 @@ Write a function that:
 - Returns a new array containing the same elements, but without the element at the passed index.
 */
 
-function remove() {
+function remove(array, id) {
+  return array.filter((elem, index) => index !==id);
 }
 
 /*
@@ -44,9 +61,16 @@ Write a function that:
 - Numbers greater 100 must be replaced with 100.
 */
 
-function formatPercentage() {
-}
-
+function formatPercentage(numbers) {
+ return numbers.map((number) => {
+  if (number > 100) {
+    number = 100;
+  }
+  return `${Number(number.toFixed(2))}%`
+}); 
+    
+  }
+  
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("first5 function works for more than five elements", () => {
diff --git a/2-mandatory/2-oxygen-levels.js b/2-mandatory/2-oxygen-levels.js
index 5711c5e5..bda8d68d 100644
--- a/2-mandatory/2-oxygen-levels.js
+++ b/2-mandatory/2-oxygen-levels.js
@@ -11,7 +11,22 @@
     Some string methods that might help you here are .replace() and .substring().
 */
 
-function findSafeOxygenLevel() {}
+ 
+
+function findSafeOxygenLevel(planets) {
+  for (let i = 0; i < planets.length; i++) {
+    const string = planets[i];
+    if (string.includes('%')) {
+      const number = string.replace("%", "");
+      const oxigenLevel = Number(number);
+      if (oxigenLevel > 19.5 && oxigenLevel < 23.5 ){
+        return number + '%'
+      
+      }
+    }
+  }
+}
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/3-bush-berries.js b/2-mandatory/3-bush-berries.js
index b434a507..0a1f94a0 100644
--- a/2-mandatory/3-bush-berries.js
+++ b/2-mandatory/3-bush-berries.js
@@ -20,10 +20,23 @@
   
   Let's first look at an example that will teach you how to use these methods.
 */
+//pink berries only safe to eat
+//other berries not safe to eat
+//Create a function which checks if the bush has ALL PINK berries and is safe for the astronauts to eat from the bush.
+//Use the tests to confirm which message to return
 
 function isBushSafe(berryArray) {
+  //for (let safeBerries = pink; index = berryArray;) {
+    const safeBerries = berryArray.filter ((pink) => pink).sort();
+    return safeBerries;
+    
+  }
   //Write your code here
-}
+//for (let index = 0; index < array.length; index++) {
+  //const element = array[index];
+  
+
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/4-space-colonies.js b/2-mandatory/4-space-colonies.js
index 30095213..f75a6ebd 100644
--- a/2-mandatory/4-space-colonies.js
+++ b/2-mandatory/4-space-colonies.js
@@ -14,8 +14,15 @@
         Logic: Only strings that start with A, and finish with family
   
 */
+//in planet "Alpha" the families who start whit A should stay the others will search for
+//other planets
+//Create a function that returns an array of colonisers.
+//hint empieza por A y debe de contener la palabra family al final
+
+function getSettlers(voyager) {
+  return  voyager.includes("family") && voyagers[0] == "A";
+}
 
-function getSettlers() {}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/5-eligible-students.js b/2-mandatory/5-eligible-students.js
index f92478e0..e9d90dfa 100644
--- a/2-mandatory/5-eligible-students.js
+++ b/2-mandatory/5-eligible-students.js
@@ -7,7 +7,16 @@
   - Returns an array containing only the names of the who have attended AT LEAST 8 classes
 */
 
-function getEligibleStudents() {}
+function getEligibleStudents(students) {
+  let optIn =[];
+  for (let eligeble = 0; eligeble < students.legth; eligeble++){
+    if (students[elegible][1]>=8){
+      optIn.push(students[eligeble][0]);
+    }
+  }
+  return optIn;
+}
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
diff --git a/2-mandatory/6-journey-planner.js b/2-mandatory/6-journey-planner.js
index 25a14083..6765499a 100644
--- a/2-mandatory/6-journey-planner.js
+++ b/2-mandatory/6-journey-planner.js
@@ -20,8 +20,8 @@
 function checkCodeIsThere(stringText) {
   let magicWord = "code";
   //edit code below
-  if (stringText) {
-    return stringText;
+  if (stringText.includes("code")) {
+    return stringText.indexOf("code");
   } else {
     return "Not found";
   }
@@ -64,7 +64,9 @@ function checkCodeIsThere(stringText) {
 
   Hint: Use the corresponding array method to split the array.
 */
-function getTransportModes() {}
+function getTransportModes(location) {
+  return location.slice(1);
+}
 
 /*
   Implement the function isAccessibleByTransportMode that
@@ -81,7 +83,9 @@ function getTransportModes() {}
 
   Hint: Use the corresponding array method to decide if an element is included in an array.
 */
-function isAccessibleByTransportMode() {}
+function isAccessibleByTransportMode(transportPlace, transport) {
+  return transportPlace.includes(transport);
+}
 
 /*
   Implement the function getLocationName that
@@ -92,7 +96,9 @@ function isAccessibleByTransportMode() {}
    - Returns the name of the location
       e.g: "Tower Bridge"
 */
-function getLocationName() {}
+function getLocationName(location) {
+  return location[0];
+}
 
 /*
  We arrived at the final method. it won't take long if you use the previously implemented functions wisely.
@@ -121,8 +127,9 @@ function getLocationName() {}
 
   Advanced challange: try to use arrow function when invoking an array method.
 */
-function journeyPlanner(locations, transportMode) {
+function journeyPlanner(location, transport) {
   // Implement the function body
+  return location.filter(( location => location.includes(transport)))
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
diff --git a/2-mandatory/7-lane-names.js b/2-mandatory/7-lane-names.js
index 40c31b68..512127ec 100644
--- a/2-mandatory/7-lane-names.js
+++ b/2-mandatory/7-lane-names.js
@@ -6,7 +6,9 @@
   HINT: string and array methods that could be helpful (indexOf, filter)
 */
 
-function getLanes() {}
+function getLanes(streets) {
+  return streets.filter(name=>name.includes("Lane"));
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */