SOLUTION: what are the steps to make set notations like {X|x<20} into an interval notation then number line

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Question 485077: what are the steps to make set notations like
{X|x<20} into an interval notation then number line
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

an interval notation:

(-infinity,20)
draw a number line and plot the point x=20 and color a number line (for ex. green) from the point 20 (excluding that point) to -infinity