A:AnswerYes, if the ink is low enough it should ask if you want to print in black and white. Or you can just set the printer setting in your computer to print gray scale. That's independent of the printer.
A:AnswerHere are some instructions on how to install ink cartridges in the HP Officejet Pro 7740 printer: https://support.hp.com/us-en/document/c05161082