Posted by claire on Wednesday, June 4, 2008 at 5:03pm.
i'm having a lot of trouble figuring out when to use a closed or an open interval.
do i use infinity in every question where both numbers are not defined?
insight?
thanks/

linear inequalities.  drwls, Wednesday, June 4, 2008 at 6:03pm
If no lower or upper or lower limit of an interval is specified, assume it is infinity (+ or )

linear inequalities.  Calc, Wednesday, June 4, 2008 at 6:12pm
Use an open when the sign is NOT including the anwser. Use a closed when the sign DOES include the answer.
Infinity is used when you have PARAELL lines.

linear inequalities.  Anonymous, Wednesday, June 4, 2008 at 6:23pm
how can i tell if something is included or not?
the answers i'm getting are like:
z>3
which is the correct answer. but when i go to graph it in the computer, i always click the wrong representation of interval notation.
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