Posted by **Caroline** on Wednesday, September 9, 2009 at 4:11am.

functions

f(x)=rad. x-9

write the intervals of the functions. How do I put the set of numbers in the form of intervals such as infinity.

I solved it and got the answer as this:

x < or = 9

(infinity,9]

Please help me, I am stuck.

- math -
**MathMate**, Wednesday, September 9, 2009 at 7:33am
(infinity,9]

means the interval's lower limit is at but excludes ∞. The exclusion is signified by the left parenthesis "(".

The upper limit is 9, and 9 is included, as indicated by the square bracker "]".

I do not quite understand the meaning of

f(x)=rad. x-9

so I cannot comment on whether the answer is correct.

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