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Is there a difference between an underlined less than sign than one that isn't underlined?
The "underlined" less than sign is actually a sign meaning "less than or equal to" and it is the equal to part which looks like an underline.
What are the critical features of an inequality?
An inequality must have a greater than sign (>) OR a less than sign (<) OR a greater than or equal to sign (≥) OR a less than or equal to sign (≤).
How can you tell when to use the greater than sign and the less than signs and in math?
If the two sides of the equation are unequal, you need the greater than or the less than sign instead of the equal sign. If the left side is less, use the less than sign. Otherwise, use the greater than sign.
What is the opposite of less than sign?
The less than sign I believe that you are talking about is the minus/subtraction sign? The addition sign, +, is the opposite of the subtraction sign :)
What does an underlined greater than sign mean?
It means greater/less than or equal to. For instance x>3 could be any number greater than 3, but not 3. With the underline, it could be any number greater than or including 3.
