Question

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

• A. $A=B$
• B. $A\subset B$
• C. $B\subset A$
• D. None of these

Answer 1

Answer: (B)

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