You can use floating:
<div class="paragraphs">
<div class="row">
<div class="span4">
<img style="float:left" src="../site/img/success32.png"/>
<div class="content-heading"><h3>Experience   </h3></div>
<p style="clear:both">Donec id elit non mi porta gravida at eget metus. Etiam porta sem malesuada magna mollis euismod. Donec sed odio dui.</p>
</div>
</div>
</div>
If you want the following <p>
to stay at the same line too, remove its
style="clear:both"
but then you should add
<div style="clear:both"></div>
after it.