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Algebra I

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My substitute teacher gaves us a worksheet that asks us to do problems we've never had before. How do I do unions and intersections on a number line using inequalities? Is there a formula for this?

Example: A intersects C
A={x|x>-3}
C={x|x greater than or equal to 0}

Example 2: A union C
A and C equal the same as above.

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