What is the vertex of tge parabola given by the equation y=x2+4

Alawn mower manufacturer incurs a total of 34,816 in overhead costs and 388 per lawn mower in production costs. how many lawn mowers were manufactured if the average cost of productions is 660

Anyone know? will mark brainliest if correct!

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)