The number 2 can be expressed in many different ways. For example the number2 in roman numerals is expressed as II
In binary the number 2 is expressed as 10
Different cultures both past and present also had there own ways of writing the number two The standard Chinese( simple numerals) expression is
It can also be expressed many different ways through use of mathematical statements. A few examples are: 1+1, 3-1, 6/3.
An algebraic expressions could be x - 6 = -4, x=2
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In infinitely many ways. However, if you want powers of positive integers only, then you can express 64 as a power of 2, 4, 8 and of 64 itself.
1+1 1*2
It is not possible to answer the question. There are infinitely many ways to express 740 as a sum of 2 numbers, an infinite number of ways to express it as a sum of 3 numbers, 4 numbers, ... , infinitely many numbers. And the same can be said for multiples of 2, 3, ... numbers. But you cannot write an infinite number of expressions. Perhaps you can start with 370+370, 371+369, 372+368, ... 740+0, 741-1, 742-2 and see how far you get in an hour. Then make a guess at your life expectancy and how many hours per day you are prepared to dedicate to this task. That will give you a maximum number of ways. It will be a maximum because you will slow down as the numbers get bigger and you have to write integers with tens of digits (I doubt that you will get that far).
There are a number of ways to express 3.4 as a fraction. Here are a few: 34/10 17/5 3 and 2/5
If your number is "n", you simply divide 2 by the number: 2/n.