Plzzz help me this test is confusing

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.

Do you need with the x value for the minimum? its always between the two intercepts for a parabola