i am assuming you mean a number with the exponent like this...
x2
x5
From my knowledge of math and calculus this just means that the x with the five means its the fifth point along that line or graph. It does not mean you numerically multiply that x by five or that x is to the fifth power. Just means its the second or fifth in the series of x's.
In this series of x's there is also a plain ol' "x" and "x3" and "x4". If you have a number you must have all the preceding numbers before it.
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A negative exponent is the reciprocal of the corresponding positive exponent. 102 = 100 10-2 = 1/100
It means the number form of the exponent.
Yes, 25 CAN BE and exponent. Any number can be and exponent
If you mean floating point number, they are significand, base and exponent.
The base of an exponent is the main number. For example in 56 the number 5 is the base and 6 is the exponent.