Which students write the correct express

What is the range of the data below? .8090100

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

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders