Brainliest answer to first answerer given the median qr and the trapezoid mnop what is the value of x? answers in the pic

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

100 points, hi, i’m not sure how to get the equation from the graph and table.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1