For f(x)=2x+1 and g(x)=x squared - 7, find (f+g)(x)

For f(x)=2x+1 and g(x)=x^2 - 7, 
 so
(f+g)(x) = 2x + 1 + x^2 - 7
(f+g)(x) =  x^2 + 2x - 6

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.