1.[tex](-7,-3)[/tex]
2.[tex][5,\alpha )[/tex]
3.[tex](-4,-\alpha )[/tex]
4.[tex](-1,0)[/tex]
Explanation
a shaded circle in number line indicates that the number in the shaded point is also included in the interval. In the interval notation this limit is expressed using a square bracket.
A circle that is not shaded in a number line indicates that the number is not included in the interval. In interval notation a bracket is used to represent that point on the number line.
An arrow shows the extension to negative or positive infinity. The symbol [tex]\alpha[/tex] is used to represent infinity and is always included in bracket.
