Question 408696
I don't think very many tutors would want to answer all nine parts. I'll get you started, though.


Here is a graph of the equation:


{{{graph(300, 300, -10, 90, -10, 90, -.5x^2 + 12x + 11)}}}


You can solve/interpret all the questions using either the quadratic formula or the vertex of the parabola (which occurs at x = -b/2a).