diff --git a/index.js b/index.js
index bdafe4c8b..8751f94e5 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,5 @@
 // ⭐️ Example Challenge start ⭐️
-
+//comment
 /**
  * ### Challenge `addNumbers`
  * 
@@ -35,8 +35,8 @@ function addNumbers(num1, num2) {
  * the returned value should look like: 'Goodbye, Andy. Have a great day.'
  * 
 */
-function sayGoodbye(/* code here */) {
-  /* code here */
+function sayGoodbye(name) {
+  return `Goodbye, ${name}. Have a great day.`
 }
 
 /**
@@ -53,8 +53,9 @@ function sayGoodbye(/* code here */) {
  * Hint 1: The formula for converting celsius to fahrenheit is t*9/5 + 32 where t is the temperature in celsius.
  * Hint 2: There is a very easy way to round numbers in JS. Do a google search to find out how. 
 */
-function temperatureCtoF(/* code here */) {
-  /* code here */
+function temperatureCtoF(celsius) {
+  const fahrenheit = Math.round((celsius * (9/5)) + 32);
+  return fahrenheit;
 }
 
 /**
@@ -74,8 +75,13 @@ function temperatureCtoF(/* code here */) {
  * 
  * Hint: You can call your `temperatureCtoF` function from inside `temperatureInF`.
 */
-function temperatureInF(/* code here */) {
-  /* code here */
+function temperatureInF(temperature, unit) {
+  if(unit === `F`){
+    return `${temperature}F`;
+  }
+  else {
+    return `${temperatureCtoF(temperature)}F`;
+  }  
 }
 
 
@@ -95,8 +101,9 @@ function temperatureInF(/* code here */) {
  *   email: "leia@leia.com",
  * }
 */
-function makePersonObject(/* code here */) {
-  /* code here */
+function makePersonObject(id, name, email) {
+  const person = {id, name, email}
+  return person;
 }
 
 /**
@@ -112,8 +119,8 @@ function makePersonObject(/* code here */) {
  * passing { id: 1, name: 'Leia', email: 'leia@leia.com` } as the argument,
  * the returned value should look like `Hello, my name is Leia`.
 */
-function getName(/* code here */) {
-  /* code here */
+function getName(person) {
+  return `Hello, my name is ${person.name}`
 }
 
 
@@ -132,8 +139,12 @@ function getName(/* code here */) {
  * passing in [ 'orange', 'grape', 'apple', 'banana', 'mango' ] as the argument,
  * the returned value should be: 2.
 */
-function appleIndex(/* code here */) {
-  /* code here */
+function appleIndex(array) {
+  for(i=0; i < array.length; i++){
+    if(array[i] === `apple`){
+      return i;
+    }
+  }
 }
 
 /**
@@ -151,12 +162,21 @@ function appleIndex(/* code here */) {
  * passing in [ 'orange', 'apple', 'banana', 'apples', 'apple', 'mango' ] as the argument,
  * the returned value should be: [ false, true, false, false, true, false ].
 */
-function isItAnApple(/* code here */) {
-  /* code here */
+function isItAnApple(array) {
+  const results = [];
+  for (i=0; i < array.length; i++)
+  {
+      if(array[i] === `apple`){
+        results.push(true);
+      }
+      else{
+      results.push(false)}
+      
+    }
+  return results;
 }
 
 
-
 /*
 // ⭐️ Example Test Data ⭐️
 
@@ -210,7 +230,8 @@ function get3rdCar(inventory) {
  * it will return `This is a Lincoln Navigator`.
 */
 function getCarInfoByIndex(inventory, index) {
-  /* code here */
+  const car = inventory[index] 
+  return `This is a ${car.car_make} ${car.car_model}`
 }
 
 /**
@@ -224,8 +245,9 @@ function getCarInfoByIndex(inventory, index) {
  * For example, if getLastCarInfo is invoked passing the inventory inside /data/inventory.js,
  * it will return `This is a Lincoln Town Car`.
 */
-function getLastCarInfo(/* code here */) {
-  /* code here */
+function getLastCarInfo(array) {
+  const last = (array.length - 1)
+  return `This is a ${array[last].car_make} ${array[last].car_model}`
 }
 
 /**
@@ -237,8 +259,13 @@ function getLastCarInfo(/* code here */) {
  *     (1) an array which is an inventory of cars like the one inside /data/inventory.js.
  * getModelYears returns an array containing all the 'car_year's in the inventory.
 */
-function getModelYears(/* code here */) {
-  /* code here */
+function getModelYears(array) {
+  const results = [];
+  for(i=0; i < array.length; i++){
+    let year = array[i].car_year;
+    results.push(year);
+  }
+  return results;
 }
 
 /**
@@ -255,8 +282,12 @@ function getModelYears(/* code here */) {
  * For example, if getCarInfoById is invoked with the inventory and the number 1,
  * it will return `This is a Lincoln Navigator`.
 */
-function getCarInfoById(/* code here */) {
-  /* code here */
+function getCarInfoById(array, id) {
+  for(i=0; i < array.length; i++){
+    if(array[i].id === id){
+      return `This is a ${array[i].car_make} ${array[i].car_model}`
+    }
+  }
 }
 
 /**
@@ -273,8 +304,14 @@ function getCarInfoById(/* code here */) {
  * with a `car_year` which is at most the given desired max year,
  * in the same order as they appear in the original inventory.
 */
-function getOlderCars(/* code here */) {
-  /* code here */
+function getOlderCars(array, maxYear) {
+  const results = []
+  for(i=0; i < array.length; i++){
+    if(array[i].car_year <= maxYear){
+      results.push(array[i]);
+    }
+  }
+  return results;
 }
 
 /**
@@ -290,8 +327,16 @@ function getOlderCars(/* code here */) {
  * made by either `Audi` or `Mercedes-Benz` or `Volkswagen` or `BMW`,
  * in the same order as they appear in the original inventory.
 */
-function getGermanCars(/* code here */) {
-  /* code here */
+
+function getGermanCars(arr){
+  const result = [];
+
+  for(let i = 0; i < arr.length; i++){
+    if (arr[i].car_make === 'Audi' || arr[i].car_make === 'Mercedes-Benz' || arr[i].car_make === 'Volkswagen' || arr[i].car_make === 'BMW'){
+      result.push(arr[i]);
+    }
+  }
+  return result;
 }
 
 /**
@@ -307,8 +352,14 @@ function getGermanCars(/* code here */) {
  *         (1) causes the odometer in the object to be increased by the distance,
  *         (2) returns the updated value of the `odometer`.
 */
-function carMaker(/* code here */) {
-  /* code here */
+function carMaker(number) {
+  const car = {
+    odometer: number,
+    drive: function(distance){
+    this.odometer +=distance;
+    return this.odometer;}
+  }
+ return car;
 }
 
 /// ////// END OF CHALLENGE /////////