When the temperature is below freezing point.
You use a negative rational number when an answer is below zero.
Multiply the positive number by any negative number and it will result in a negative number.
Negative numbers are useful whenever there are two opposites. For example, going up might be described by a positive number, going down by a negative; gaining money might be described by a positive number, losing money by a negative number. Such numbers will typically NOT be integers; you can use integers whenever the unit used (and the precision required) does not require you to use decimals. For example, "altitude below sea level" will be a negative number; if you don't need numbers less than a meter, you can use whole meters.
Most calculators have a +/- (+ is positive, - is negative) symbol on them, which allows you to use the negative function. To do so, simply key in the number, then hit the +/- sign, which will then put the number in negative (minus) status. But if you already have a negative number, for example if you key in 25 - 30, you will have a -5, then you can hit the symbol to make it a positive number if that's what you want. In other words, when you hit that function, it will give you the opposite of what's in it at the time. For example, if the display shows a positive number and you hit that function, you will then have a negative number. If it shows a negative number and you hit that function, you will then have a positive number.
The canonical example is the square root of -1. Mathematicians use the symbol i to represent it, electrical engineers use j because i is already busy.
Yes you could, and it is an excellent idea.
The product would be a negative number. When you multiply with a negative, it doesn't matter how many negatives, the product will always be a negative. For example: if you were to multiply 2x3x4x5x6x7x8x9x-3x-7x-9=-68,584,320. If you don't believe me, use your calculator.
A negative number multiplied by a negative number will yield a positive number.
You use a negative rational number when an answer is below zero.
There are a number of words you could use that would have the same meaning as fighting. You could use arguing for example.
You could use the ABS function which takes a number and ignores its sign, so it can turn negative numbers into positive ones. So for example, the following will result in 5: =ABS(-5) You can also put a minus before a minus number to make it positive: --5
There are a number of methods you could use to seal an armpit. You could spray it with water sealant for example.