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Math·Advanced Math·Nonlinear functions

hard

x	y
16	-7
19	11
22	-7

The table shows three values of $x$ and their corresponding values of $y$, where $y=f(x)+6$ 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?

1

-717