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Math helps you with many life situations. You might not understand some of the things you learn when you are younger and how it will help you in life but it is all preparation for the bigger situations
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Things whose values do not change.
Number of calories vs. amount of weight gain. Length of a candle vs. time it is burning. Miles driven vs. gallons of gas used.
One can apply consumer demand management to real life situations in a number of different ways. One way is to manage a business, as it would come it handy.
Difficult situations from real life, in which people might lie or cheat. - APEX
A negative number times a negative number gives you a POSITIVE number, not a negative number.
There are many situations where integers are simply not enough. However, "real numbers" are mainly of theoretical importance; for most practical situations, numbers that have a limited number of decimals work quite well.
For example mecury in a thermometer.
The measurement of a length of an object is always a positive number.