multi-task or Multitask -the hyphen is not necessary-
I do not believe that multitasking is supposed to have a hyphen.
That is correct. It may also be spelled without the hyphen
No. Just looked it up in a printed dictionary. In fact, no work with the 'multi' prefix uses a hyphen. For example, multilateral
demerits of multi purpose river valley projects
Here is an example of using a hyphen correctly: Justin was purpose-driven by his motivation to finish well.
Do "Break into the Armory" for a chance to loot multi-purpose truck!
multi purpose
Multi-purpose computers are capable of doing lots of different things. A PC is a multi-purpose computer, whereas a washing machine is a computer that is designed specifically to do one thing. Multi-tasking computers can do lots of things at the same time.
Multi Purpose Cooperative combines two or more of the business activities of different types of cooperatives.
Multi-purpose
The stand alone trimmers are really best for your eyebrows however the multi purpose tools work. Make sure if you are getting a multi purpose one that you use the attachment that is for eyebrows.