If $x=2$ and $y=x^{2}-5$ and $z=y^{2}-5$, then $z$ equals
(A) -6
(B) -8
(C) 4
(D) 76
(E) -4
Since $x=2$ and $y=x^{2}-5$, then $y=2^{2}-5=4-5=-1$.

Since $y=-1$ and $z=y^{2}-5$, then $z=(-1)^{2}-5=1-5=-4$.

ANsWer: (E)