Which expresses 9x2y2 as a perfect square?3xy

3x2y2

(3xy)2

9xy

Dis a correct answer

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.

sorey ik so sorey i need and need to answer a few