diff --git a/04 - Array Cardio Day 1/index-START.html b/04 - Array Cardio Day 1/index-START.html
index 8e1b928a41..03eb5f0b20 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -36,8 +36,8 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
-    //const fifteen = inventors.filter(inventor => inventor.year >= 1500 && inventor.year < 1600);
-    //console.table(fifteen);
+    const fifteen = inventors.filter(inventor => inventor.year >= 1500 && inventor.year < 1600);
+    console.table(fifteen);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
@@ -46,11 +46,20 @@
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    const sorted = inventors.sort((a, b) => a.year > b.year ? 1 : -1);
+    console.table(sorted);
+
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce((total, inventor) => {
+      return total + (inventor.passed - inventor.year);
+    }, 0);
+    console.log(totalYears);
 
     // 5. Sort the inventors by years lived
+    const yearsLived = inventors.sort((a, b) => (a.passed - a.year) > (b.passed - b.year) ? -1 : 1);
+    console.table(yearsLived);
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris