How can I determine if there were solicitation responses received from Vendors for my solicitation?

You will open your solicitation document in CORE and click on View Procurement Folder located in the Header Section of the document.  From there you will scroll down to the Documents section to view the solicitation responses associated with the Solicitation.  

Screenshot of Apply Default Value to Commodity Lines and View Procurement Folder buttons with a green arrow pointing to the View Procurement Folder button.
Screenshot of the Procurement Folder with an green arrow pointing to the third row for Solicitation Responses.