For navigational purposes
Every aspect of mathematics depends upon integers, and even if you don't do any mathematics, you count things with integers. If you even want to know how many guests you are having for dinner, you need to use integers.
You can sometime use integers but often speed or velocity can also be irrational.
Yes.
You can use them for counting, which is in fact addition. You can also use them for subtracion. Integers are natural numbers. This means you don't use decimals or fractions.
Pilots use mostly electronic equipment. If electronics go out they use instruments.
There are several different ways that you can use integers in everyday situations. For example you can use integers in the Winter, you use them with the temperature.
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pilots use barometers because they don't want to crash because of the air pressure might be high
The Chinese and Hindu were the first to use negative integers
usually there ears
luggage works
For navigational purposes
Personally, I use them to count with.
Counting
Yes. Pilots use coordinate grids to map out their destinations. Air travel managers also use grids to track planes coming in and out of the airport.
Every aspect of mathematics depends upon integers, and even if you don't do any mathematics, you count things with integers. If you even want to know how many guests you are having for dinner, you need to use integers.