Plz help me

What are the domain and range of the function? f(x) = -4 (sqrt)x

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

Solutions for 2x+7 less than or equal to 3x-5