Which ordered pair is a solution of the equation ?

Given the box plot, will the mean or the median provide a better description of the center? box plot with min at 10.5, q1 at 11.5, median at 12.5, q3 at 13.5, max at 15

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

How is this equation completed? i cannot find any examples in the book.