can i print from an apple computer to a Dell printer
Yes.

Macs have built-in drivers that allow you to print to just about any USB printer.

And if the computer doesn't already have drivers (although, just about every consumer printer does), Dell supplies drivers for Mac.
You may also need to install the custom drivers if you want more advanced functionality (e.g, some brands require you to install their drivers to enable networked print).

You can easily add printers using the the Print &amp; Scan pane of System Preferences: Just click the plus button.