How Do I Know Which Version Of WordPress Is Running?
Log into WordPress Admin and go to WordPress updates. A message will be displayed that gives the current version and whether a new version is available.
How Do I Know Which Version Of PHP Is Running?
Easiest is to ask your host. Or run a PHP file with the code echo phpversion();
How Do I Know Which Version Of MySQL Is Running?
Easiest is to ask your host. Or log in to cPanel, run up phpMyAdmin, connect to your WordPress database and execute a line of SQL select version();