Question eff1fea0

Advanced Math - Nonlinear functions

$x$	$y$
$21$	$negative 8$
$23$	$8$
$25$	$negative 8$

The table shows three values of $x$ and their corresponding values of $y$ , where $y = f (x) + 4$ and $f$ is a quadratic function. What is the y-coordinate of the y-intercept of the graph of $y = f (x)$ in the xy-plane?