3-5

Take the first 10-20 minutes or so and discuss the questions from Friday with 1-2 other people. The answers I came up with are below. However, you might have had something different, but does it mean the same thing?: If you got something different and you are not sure if its the same, do some more research and see what you come up with.

__**Questions from Friday:**__ a) What is interval notation? Rewriting inequalities using numbers, infinity symbols, and/ or both with grouping symbols.

b) What is the difference between brackets and parenthesis in interval notation? Brackets indicate closed circles on a # line and that the number is included in the solution set. Parenthesis indicate open circles on a # line and that the number is not included in solution set.

c) What do union and intersection mean for interval notation? How are they represented? Union looks like a "u" and intersection looks like an upside down "u" almost like a "n". Union means 'or', the answer can be in one set OR the other, or both. Intersection means 'and', or the answer must be in BOTH sets

d) How would you represent "All Real Numbers Except 3" in interval notation? (-infinity,3) u (3,infinity)

These are some notes on interval notation. Pay close attention to the examples, that is the most important part.

Below are some problems to work out. You need to complete the odds and turn them in on the google doc. Obviously, you do not have to graph them!

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