diff --git a/src/challenge.ts b/src/challenge.ts
index 63a7766..46aae85 100644
--- a/src/challenge.ts
+++ b/src/challenge.ts
@@ -8,9 +8,12 @@
 // logger<number>([1, 2, 3]);
 // logger<number | string>([1, 2, 3, "one", "two", "three"]);
 function logger<T>(array: T[]): void {
-  // write your code here...
+  // write your code here...function logger<T>(array: T[]): void {
+  array.forEach(item => console.log(item));
 }
 
+
+
 // `toCelsius` function that:
 // - Accepts "temperatures" parameter of type "number[]", representing temperature values in Fahrenheit.
 // - Returns an array containing the converted temperatures in Celsius.
@@ -19,10 +22,11 @@ function logger<T>(array: T[]): void {
 // toCelsius([32, 68, 100, 212]); // => [0, 20, 37.7778, 100]
 function toCelsius(temperatures: number[]): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return temperatures.map(f => (f - 32) * (5 / 9));
 }
 
+
+
 // `hottestDays` function that:
 // - Accepts "temperatures" parameter of type "number[]"
 // - Accepts "threshold" parameter of type "number"
@@ -32,16 +36,22 @@ function toCelsius(temperatures: number[]): number[] {
 // hottestDays([80, 90, 100, 110], 95); // => [100, 110]
 function hottestDays(temperatures: number[], threshold: number): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return temperatures.filter(temp => temp > threshold);
 }
 
+
+
 // `logHottestDays` function that:
 // - Accepts "temperatures" parameter of type "number[]", representing temperature values in Fahrenheit.
 // - Accepts "threshold" parameter of type "number"
 // - Log temperatures that exceed the threshold to the console IN DEGREES CELSIUS  (hint: you can combine all previous functions)
 function logHottestDays(temperatures: number[], threshold: number): void {
   // write your code here...
+  const hotter = hottestDays(temperatures, threshold);
+  const inCelsius = toCelsius(hotter);
+  logger(inCelsius);
 }
 
+
+
 export { logger, toCelsius, hottestDays, logHottestDays };
diff --git a/src/filtering.ts b/src/filtering.ts
index 49411d8..b6c0050 100644
--- a/src/filtering.ts
+++ b/src/filtering.ts
@@ -11,10 +11,9 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 // greaterThanTwentyFive(numbers); // => [38, 35, 40]
 function greaterThanTwentyFive(numbers: number[]): number[] {
   // write your code here...
+  return numbers.filter((grade: number) => grade >= 25)
 
-  return []; // replace empty array with what you see is fit
 }
-
 // `divisibleByFive` function that:
 // - Accepts "numbers" parameter of type "number[]".
 // - Return a new array containing numbers that are divisible by 5.
@@ -22,8 +21,18 @@ function greaterThanTwentyFive(numbers: number[]): number[] {
 // divisibleByFive(numbers); // => [10, 20, 25, 35, 40]
 function divisibleByFive(numbers: number[]): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return numbers.filter (num => num % 5 ===0 );
 }
 
 export { greaterThanTwentyFive, divisibleByFive };
+
+
+
+
+
+
+
+
+
+
+
diff --git a/src/mapping.ts b/src/mapping.ts
index 6f18eef..0cd459a 100644
--- a/src/mapping.ts
+++ b/src/mapping.ts
@@ -11,10 +11,11 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 // squaredNumbers(numbers); // => [100, 169, 400, 625, 1444, 1225, 1600]
 function squaredNumbers(numbers: number[]): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return numbers.map(num => num * num);
 }
 
+
+
 // `doubledNumbers` function that:
 // - Accepts "numbers" parameter of type "number[]".
 // - Return a new array that contains each number multiplied by 2.
@@ -22,8 +23,9 @@ function squaredNumbers(numbers: number[]): number[] {
 // doubledNumbers(numbers); // => [20, 26, 40, 50, 76, 70, 80]
 function doubledNumbers(numbers: number[]): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return numbers.map(num => num * 2);
 }
 
+
+
 export { squaredNumbers, doubledNumbers };
diff --git a/src/mapping_filtering.ts b/src/mapping_filtering.ts
index 269ad83..d790f7b 100644
--- a/src/mapping_filtering.ts
+++ b/src/mapping_filtering.ts
@@ -12,9 +12,13 @@ const numbers = [10, 13, 20, 25, 38, 35, 40];
 function filteredAndSquared(numbers: number[]): number[] {
   // write your code here...
 
-  return []; // replace empty array with what you see is fit
+  return numbers
+    .filter(num => num >= 20)  
+    .map(num => num * num);    
 }
 
+
+
 // `filteredAndTripled` function that:
 // - Accepts "numbers" parameter of type "number[]".
 // - Return an array of numbers, where each number is tripled if it is divisible by 5.
@@ -22,8 +26,11 @@ function filteredAndSquared(numbers: number[]): number[] {
 // filteredAndTripled(numbers); // => [30, 60, 75, 105, 120]
 function filteredAndTripled(numbers: number[]): number[] {
   // write your code here...
-
-  return []; // replace empty array with what you see is fit
+  return numbers
+    .filter(num => num % 5 === 0)  
+    .map(num => num * 3);          
 }
 
+
+
 export { filteredAndSquared, filteredAndTripled };