Question

Interval Notation and how is it used?

Answer 1

interval notation is another method for writing domain and range.In set builder notation braces (curly parentheses {} ) and variables are used to express the domain and range. Interval notation is often considered more efficient. in interval notation, there are only 5 symbols to know:

Open parentheses ( )
Closed parentheses [ ]
Infinity ∞
Negative Infinity −∞
Union Sign ∪

Answer 2

The things with infinity in parentheses confuse me. whats to know about that?

Answer 3

you always use parentheses with infinity

Answer 4

Like the points? I think its domain and range.

Answer 5

this might help. http://cnx.org/content/m15265/latest/