f(x) = x-16x+60 (Type an ordered pair, using integers or fractions.) (b) Find an equation for the axis of symmetry. x=8 (Type an equation. Use integers or fractions for any numbers in the equation.) (c) Determine whether the parabola has a maximum or a minimum and find its value. Select the correct choice below and fill in the answer box within your choice. (Type an integer or a fraction.) OA. The parabola opens upward and has a minimum value of B. The parabola opens downward and has a maximum value of