If f(n) = n 2 - 2n, then f(2) = 0. true or false ?

It is true because it gives you zero. You plug in 2 for n and then you simplify and get 2(2)-2(2) and that would get you 4-4 which is 0. Hope this helps.

This is true because it does give you zero 0

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.

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