Up and about means someone is getting busy or carrying out several activities Soon it became commonplace to ask people what they are up to and this is how this phrase came aboutHow many meanings does it have?Vertical Line Test On a graph, the idea of single valued means that no vertical line ever crosses more than one value If it crosses more than once it is still a valid curve, but is not a function Some types of functions have stricter rules, to find out more you can read Injective, Surjective and Bijective Infinitely Many My examples have just a few values, but functions usually work on
40 Millennial Slang Words And What They Mean Popular Slang Terms