SOLUTION: C AND D ARE SETS OF REAL NUMBERS C{x|x<3} D{x|x< has a line under 9} C U D = C DOWNWARD U D = UNION AND INTERSECTION INTERVALS

Question 1085741: C AND D ARE SETS OF REAL NUMBERS
C{x|x<3}
D{x|x< has a line under 9}
C U D =
C DOWNWARD U D =
UNION AND INTERSECTION INTERVALS

Answer by math_helper(2461) (Show Source): You can put this solution on YOUR website!
C is the set of real x such that
That's everything to the left of the 3 below, excluding the 3 itself:

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D is the set of real x such that
That's everything to the left of the 9 below, including the 9 itself:

{C} U {D} is the region to the left of the 9, including the 9 itself. Since D includes C, the union of the two sets coincides with D. Using interval notation, it would be written ( , ] (open paren's means that endpoint is excluded, square bracket means that endpoint is included).
{C} intersect {D} is the region to the left of 3 (excluding the 3 itself) and coincides with set C. In interval notation: ( , )
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