diff --git a/week3/homework/calculator.rb b/week3/homework/calculator.rb
new file mode 100644
index 0000000..037b24b
--- /dev/null
+++ b/week3/homework/calculator.rb
@@ -0,0 +1,24 @@
+class Calculator
+  def sum(values)
+    values.inject(0) { |result, next_val| result + next_val }
+  end
+  def multiply(*values)
+    values_list = Array.new
+    if (values.first.kind_of?(Array))
+      values_list += values.first
+    else
+      values_list += values
+    end
+    values_list.inject { |result, next_val| result * next_val }
+  end
+
+  def pow(base, exponent)
+    result = 1
+    exponent.times{ result *= base }
+    result
+  end
+
+  def fac(value)
+    value == 0 ? 1 : (1..value).inject { |result, next_val| result * next_val }
+  end
+end
\ No newline at end of file
diff --git a/week3/homework/questions.txt b/week3/homework/questions.txt
index dfb158d..671955d 100644
--- a/week3/homework/questions.txt
+++ b/week3/homework/questions.txt
@@ -6,10 +6,24 @@ Please Read:
 
 1. What is a symbol?
 
+A: A symbol is Ruby's immutable string-like unique primative, used when creating a variable that stands for something significant, much like enumerables in other languages. An example might be creating a symbol for each direction like :up, :down, :left. :right.
+
 2. What is the difference between a symbol and a string?
 
+A: Strings are mutable, symbols are immutable. 
+
 3. What is a block and how do I call a block?
 
+A: Blocks are chunks of code inbetween delimeters, curly braces or keywords 'do' and 'end'. Blocks are called with a method name, code wrapped in the do and end keywords and any parameters passed to the block with pipes '|' on either side.
+
+method_name {|parameter| parameter.work}
+
 4. How do I pass a block to a method? What is the method signature?
 
+A: You can pass a block to a method by immediately including a block following a method name. The method signature does not have to be special, and does not have to take any special parameters. However to emit values to a block, the method definition needs to contain the yield keyword. 
+
+method_name {|parameter| parameter.work}
+
 5. Where would you use regular expressions?
+
+A: Regular expressions are used in any situation that calls for string finding/matching. Regex's can be used for user input validation, manipulation/searching of large text files, or even extraction of values from unstructured data.