9 options: For a homework question, students were asked to complete the square of a quadratic function given in the form y = a x 2 + b x + c . A student had the following step written y = 0 . 5 x 2 - 8 x + m + 10 - n If the above quadratic function was written in vertex form by completing the square, the vertex could be written in the form ( p , q ) . The value of p is