Someone please solve for me I don’t understand

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

The given dot plot represents the average daily temperatures, in degrees fahrenheit, recorded in a town during the first 15 days of september. if the dot plot is converted to a box plot, the first quartile would be drawn at __ , and the third quartile would be drawn at __ link to graph: .

Bring the fraction a/a-4 to a denominator of 16-a^2