@@ -25,15 +25,15 @@ Tip: use logical operators
 
 function validate(num) {
 
-if (num <= 100)
- {
- num = true;
+if (num <=100 && typeof num === "number" && num % 2 == 0)
+  {
+ return true;
 }
 else {
-  num =false;
+  return false;
 }
 }
-validate(20);
+console.log(validate(20));
 
 
 /* 
@@ -42,7 +42,11 @@ The function must NOT change the original array, arr.
 */
 
 function remove(arr, index) {
-return; // complete this statement
+  if (arr.length > index) {
+    return arr;
+    }
+   
+// complete this statement
 }
 
 
@@ -54,7 +58,11 @@ Write a function that:
 - numbers greater 100 must be replaced with 100
 */
 
-function formatPercentage(arr) {}
+function formatPercentage(arr) {
+
+
+  
+}
 
 
 
 
@@ -8,11 +8,24 @@
 
   1. This program throws an error. Why? (If you can't find it, try executing it).
   2. Remove the line that throws the error.
+  // The error was console.log(b);
   3. What is printed to the console?
+  // 2
+     6
+     4
+     9
+     6
+     13
+     8
   4. How many times is "f1" called?
+  // f1 called three times.
   5. How many times is "f2" called?
+  //f2 called four times.
   6. What value does the "a" parameter take in the first "f1" call?
+    "a" is equal to 6 ;
+
   7. What is the value of the "a" outer variable when "f1" is called for the first time?
+ "a" is equal to 7 ;
 */
 
 let x = 2;
@@ -28,7 +41,7 @@ const f2 = function(a, b) {
 
 console.log(x);
 console.log(a);
-console.log(b);
+
 
 for (let i = 0; i < 5; ++i) {
   a = a + 1;
 
@@ -14,7 +14,16 @@ You don't have to worry about making this algorithm work fast! The idea is to ge
 "think" like a computer and practice your knowledge of basic JavaScript.
 */
 
-function sortAges(arr) {}
+function sortAges(arr) {
+
+
+  
+}
+
+
+
+
+
 
 /* ======= TESTS - DO NOT MODIFY ===== */