They are: 25 minus 4 = 21
They are: 25-4 = 21
25 and 4 or 121 and 100
There is no such number.
4 and 25 are.
21 is not the square of an integer. The closest square number is 25.
It can be if the first number is x + 21 and the second is x for any number x.
You can make lots of equations that have the solution 21. Here is one:x = 21If you think that is too trivial, add, subtract, multiply, or divide the same number to or from both sides.
The number is 21.
112 - 102 = 21
The rule is: add 5, subtract 2, add 5, subtract 2, . . . Next number is 24.
To square a number, you multiply it by itself. In this case, 21 x 21 is 441
The square roots of 21 are 4.5826 (rounded) and the negative of the same number.
24 because to find the number of neutrons you subtract the atomic number from the mass number. 45-21=24.
If the reverse square root of the reverse of square of a number is the number itself then it is Adam Number. For ex., 12 and 21 Take 12 square of 12 = 144 reverse of square of 12 = 441 square root of the reverse of square of 12 = 21 The reverse square root of the reverse of square of 12 = 12, then number itself. Such number is called Adam Number. cool....................
First you subtract six, then add eight, then add six so far. I'm not sure, but I think you subtract eight next, which would make the next number 13 again.
Square Number: A number that is a product of some integer with itself. Therefore, 21 is not a perfect square. An example of a perfect square is 16, since 4 times 4 is 16.
14. If you have the numbers in order like so: 7,9,11,14,21 you can see that 21 is the greater number. You then subtract 21 from the smallest number, 7, and you get 14.
First you have to make the same denominators: Find the lowest number that 7 and 3 both go into which is 21. So multiply the denominator by the number that makes 21 on both 2/7 and 1/3. Make sure to multiply the number you used on den. on the numerator to. Here are the new fractions: 6/21 and 7/21 Then subtract as normal. Answer would be negative 1/21 or -1/21