diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..ab5ba8c 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,6 @@
 export function fibonacci(value) {
-  // implementar logica aqui
-  
-}
\ No newline at end of file
+    if(value < 2) {
+    return value
+    }
+    return fibonacci(value - 1) + fibonacci(value - 2)
+}
diff --git a/08-isAnagram/index.js b/08-isAnagram/index.js
index 918308a..b372722 100644
--- a/08-isAnagram/index.js
+++ b/08-isAnagram/index.js
@@ -1,4 +1,8 @@
 export function isAnagram(word1, word2) {
-  // implementar logica aqui
-  
+  if (word1.length !== word2.length) {
+    return false;
+}
+if (word1.length === word2.length) {
+    return true;
+}
 }
\ No newline at end of file
diff --git a/09-mostRepeatedChar/index.js b/09-mostRepeatedChar/index.js
index b113ed8..b166777 100644
--- a/09-mostRepeatedChar/index.js
+++ b/09-mostRepeatedChar/index.js
@@ -1,4 +1,15 @@
 export function mostUsedChar(text) {
-    // implementar logica aqui
-    return ""
+    let h = new Set();
+     
+     for(let i = 1; i <= text.length - 1; i++)
+     {
+         let c = text[i];
+  
+         if (h.has(c))
+             return c;
+              
+         else
+             h.add(c);
+     }
+     return '\0';
 }
\ No newline at end of file
diff --git a/10-longestWords/index.js b/10-longestWords/index.js
index a98d2d8..9d3e1b3 100644
--- a/10-longestWords/index.js
+++ b/10-longestWords/index.js
@@ -1,4 +1,7 @@
 export function longestWords(words) {
-    // implementar logica aqui
-    
-}
\ No newline at end of file
+    var longest = "";
+    for (var word of words) {
+        if (words.length > longest.length) longest = words;
+    }
+    return longest;
+}