Try form_tag helper and set your path
<%= form_tag calc_path do %>
<ol>
<% for poll_answer in @poll_question.poll_answers %>
<li>
<%= radio_button_tag "poll", poll_answer.content ,true%>
<%= h poll_answer.content %>
</li>
<% end %>
</ol>
<%= submit_tag "Submit" %>
<% end %>
In your route.rb file add the following
post 'calc' => 'poll_questions#calc', as: :calc