Assuming no repeats and possible can start with the zero: First digit can be one of 5, second digit can be one of 4 etc, so there a re 5 x 4 x 3 x 2 possibles ie 120
Yes: four cubic numbers are possible.
An infinite amount of different numbers can be use to make the number 23
24
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. You must make sure it can be written as a fraction.
To give the particular number the largest possible value, arrange the digits in the order of their individual value, beginning with the largest one on the left and smallest on the right. To give the particular number its smallest possible value, arrange the digits in the order of their individual value, beginning with the smallest one on the left and largest on the right.
You arrange the numbers from highest to lowest, so the answer is 974.
Yes: four cubic numbers are possible.
Three
123,456 would be the smallest number using all 6 digits. You arrange the numbers from lowest to highest.
4! = 4 * 3 * 2 * 1 = 24 ways[1]
If you can arrange the counters in the shape of a rectangle with at least two in each row and each column then the number is composite. The numbers of row and the numbers of columns are factors of the given number. If the only rectangle you can make is the "degenerate" one, with only one row or only one column, then the number is prime.
An infinite amount of different numbers can be use to make the number 23
you could arrange them in order, add them, subtract them, multiply them, divide them, make a power of them, integrate them, and so on.
24
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. You must make sure it can be written as a fraction.
The factorization of a number is a series of numbers that make that number 
To give the particular number the largest possible value, arrange the digits in the order of their individual value, beginning with the largest one on the left and smallest on the right. To give the particular number its smallest possible value, arrange the digits in the order of their individual value, beginning with the smallest one on the left and largest on the right.