title: Run times for while loop (Mathematical)
body: <p>So I need a mathematical expression for the following loop, but I can't seem to grasp it. I am assuming I am just missing something simple. </p>
  
  <pre><code>while a &lt;= b
      a = a + a
  end
  </code></pre>
  
  <p>Using an analysis, what would be the run time of this function?</p>