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Why is there a need for negative numbers?
To show a mathematical relation of loss and in some cases direction.
Why is the number line of a number is never negative?
A number line can have both positive and negative numbers. You can put the number line in any position, but often it is represented so that numbers to the right of zero are positive, and numbers to the left of zero, negative.
Can negative numbers have a square root?
Yes, but they are imaginary - but are needed in many mathematical calculations. The square root of negative 1 is indicated as the letter "i".
Math term for integers?
Integer is a mathematical term to define the set of whole numbers both positive and negative
What sign is it if you have two numbers together?
It depends on what two numbers you have together and what mathematical operation you are applying and much greater one number is that the other number and if those numbers are positive or negative.
