Solve the equation 72 = 12 + 4 and explain what the solution tells you about the number of shirts printed and the cost.

So you would subtract 12 from both sides to get 60 equals 4x. Divide both sides by 4, and you get x=15. So she has sold 15 shirts. 

It would be the second one because it passes the vertical line test

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.