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  4. If A=(-3,5) and B=[-7,9], then

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Q. If $A=(-3,5)$ and $B=[-7,9]$, then

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Solution:

The interval $A=(-3,5)$ can be written as $\{x:-3 < x < 5\}$.
The interval $B=[-7,9]$ can be written as $\{x:-7 \leq x \leq 9\}$.
Hence, $ A \subset B$