7.
\((1)\)命题\(\exists {{x}_{0}} < 0,{{x}_{0}}^{2} > 0\)的否定是____________
\((2)\)若抛物线\(y²= -2px(p > 0)\)上有一点\(M\),其横坐标为\(-9\),它到焦点的距离为\(10\),则点\(M\)的坐标为________.
\((3)\)在\(\Delta ABC\)中,角\(A,B,C\)的对边分别为\(a,b,c\),若\({\sin A}=\sqrt{3}{\sin C},B={{30}^{\circ }},b=2\),则边长\(c=\_\_\_\_\_\_\)
\((4)\)已知\(F\)为双曲线\(C\):\(\dfrac{{{x}^{2}}}{4}-\dfrac{{{y}^{2}}}{12}=1\)的左焦点,\(A(1,4)\),\(P\)是\(C\)右支上一点,当\(\triangle APF\)周长最小时,点\(F\)到直线\(AP\)的距离为_____.