MCQ
If $|x+2| \leq 9,$ then...
- A$x \in(-11,7)$
- ✓$x \in[-11,7]$
- C$x \in(-\infty,-11] \cup[7, \infty)$
- D$x \in(-\infty,-11] \cup(7, \infty)$
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$I$. $\left(\sum_{k=1}^{2018} k x_k\right)^2 \leq N\left(\sum_{k=1}^{2018} k x_k^2\right)$
$II$. $\left(\sum_{k=1}^{2018} k x_k\right)^2 \leq N\left(\sum_{k=1}^{2018} k^2 x_k^2\right)$ Then,