title: Sum of numbers in a list using Scheme
body: <p>I want to sum the numbers in a list without using recursion. I know you can sum a list of numbers like this</p>
  
  <blockquote>
    <p>(+ num1 num2 ... numN)</p>
  </blockquote>
  
  <p>but what if you have a list L which equals to '(num1 num2 ... numN)
  is there a way to make + take the numbers in this list as arguments. I need to do this without recursion or helper functions.</p>