diff --git a/src/brackets/index.js b/src/brackets/index.js
index 96b6766..8f7bae1 100644
--- a/src/brackets/index.js
+++ b/src/brackets/index.js
@@ -4,6 +4,9 @@
  * @param {string} str The string of brackets.
  * @returns {"valid" | "invalid"} Whether or not the string is valid.
  */
-function isValid(str) {}
+function isValid(str) {
+    while(/\(\)|\[\]|\{\}/g.test(braces)){braces = braces.replace(/\(\)|\[\]|\{\}/g,"")}
+    return !braces.length;
+}
 
 module.exports = isValid;
diff --git a/src/roman-numerals/index.js b/src/roman-numerals/index.js
index 38afb19..b524bd0 100644
--- a/src/roman-numerals/index.js
+++ b/src/roman-numerals/index.js
@@ -4,6 +4,10 @@
  * @param {string} roman The all-caps Roman numeral between 1 and 3999 (inclusive).
  * @returns {number} The decimal equivalent.
  */
-function romanToDecimal(roman) {}
+function romanToDecimal(roman) {
+    var conversion = {M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1};
+   
+   return roman.match(/CM|CD|XC|XL|IX|IV|\w/g).reduce((accum, roman) => accum + conversion[roman], 0);
+}
 
 module.exports = romanToDecimal;
diff --git a/src/transpose/index.js b/src/transpose/index.js
index adec201..7351210 100644
--- a/src/transpose/index.js
+++ b/src/transpose/index.js
@@ -4,6 +4,10 @@
  * @param {number[]} array The array to transpose
  * @returns {number[]} The transposed array
  */
-function transpose(array) {}
+function transpose(array) {
+    return array[0].map((_, i) => array.map(row => row[i]));
+}
+console.log(transpose([[9, 1, 2, 3], [4, 5, 6, 7], [8, 9, 10, 7], [1, 3, 1, 5]])); 
+
 
 module.exports = transpose;