What is the answer for this i need help!!??

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Ineed me i stuck and i don’t want to get it wrong