Negative numbers exisit because negative numbers are useful to describe values on a scale below zero (0), such as temperature and also book kepping where they can be used to represent credits
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The square of a "normal" number is not negative. Consequently, within real numbers, the square root of a negative number cannot exist. However, they do exist within complex numbers (which include real numbers)and, if you do study the theory of complex numbers you wil find that all the familiar properties are true.
Yes, because PV=nRt From this equation it becomes apparent that air pressure, V, can be negative. Since negative temperatures can exist, such as -30C (remember you have to use Celsius and not Fahrenheit). Thus we have negative numbers for air pressure.
The product of three negative numbers is negative.
They will be negative numbers as for example -5+(-7) = -12
No, it is measured in positive numbers but it can be represented by negative numbers.