16, becasue 4 is the square of 2 and 9 is the square of 3, so 16 is next as it is the square of 4.
The next number in the sequence is 18. It's +1, +2, +3, +4, ....
16 is the next squared number.
the answer is 9
11
16
This is a sequence of perfect squares. 12=1, 22=4, 32=9, 42=16, 52=25. The next number is 62=36.
The answer is: 1,4,9,16,25,36 and so on.
18
5
The nest number in the sequence is 18. Note that the difference between each number and the next number in the sequence follows the simple sequence of 1,2,3,4. Obviously the next in the sequence of increases is 5, so 13+5=18.
10
3