Question

Which interval represents the set of numbers that are greater than or equal to $-1$ but are less than $9$?

• A. $(-1,9]$
• B. $[-1,9]$
• C. $(-1,9)$
• D. $[-1,9)$
• E. None of these

Answer 1

The correct option is D $[-1,9)$

Since we have to consider the number greater than or equal to $-1$. Therefore, there is closed bracket on $-1$.

Also, the number is less that $9$, so there is an open bracket on $9$.

Thus, the required interval is $[-1,9)$
Hence, option $D$ is correct.