In the equation of a periodic motion it could represent the amplitude, frequency or phase.
The next number!
231
It represents a number.
The previous number!
a rational number which is a fraction
The next number!
It could be the molecular mass. The decimal place represents the fact that different isotopes of each element exist in different proportions, so the listed mass is an average of sorts.
231
The binary number 10000000 represents the decimal 128
Yes.
a rational number which is a fraction
It represents a number.
The previous number!
A proper fraction in which the denominator is a power of 10.
As a decimal, it is 4. This is an integer and there is not a sensible way to represent it as a mixed number.
It is a non-terminating decimal, which could represent a rational number or an irrational number.
The binary equivalent for the decimal number 23 is 10111