Try this solution (see the attachment); it consists of 5 basic steps.
The answers are marked with red and green colour.
Answer:
B.
Step-by-step explanation:
You are given the double inequality

This means that x is greater than 1 and less than or equal to 6.
Thus, point 1 must be excluded (with bracket "(") and 6 must be included (with bracket "]").
Hence, the correct answer is ![(1,6].](https://tex.z-dn.net/?f=%281%2C6%5D.)
Answer:
Well-defined
Step-by-step explanation:
Because it clearly refers to the cities in the U.S.