21
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.
7x / 2 = 3 7x=2(3) 7x=6 x=6/7 The answer is x=6/7
-6
9
The 'missing' number is... 7 !
This missing number is 5
9
It is: 21/3 = 7
7/3 = 2.3333
The first five prime numbers starting from 1 are 1, 2, 3, 5, 7. So 2 is the missing number.
0 is the missing number.
31/7 = 4r3r7 number is 4.428571429