Mean = 4 so sum = 4*4 = 16
The sum of the three numbers is 12 so the fourth is 16-12 = 4.
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The missing number is 49. This is why: 1 plus 2 equals 3, then 3 squared is 9. 2 plus 3 equals 5, then 5 squared is 25. Therefore, the missing number must be 49 to make the number sentence (3 plus 4 equals 7, then 7 squared is 49) true.
Number missing (dividend) divided by 5 (divisor)= quotient need 2 of 3 numbers to solve for missing number
21
It is 11 which is also a prime number
0 is the missing number.