Question

9,3,4, 12, 21, x
what is x ?​

Answer 1

Answer:

85

Step-by-step explanation:

We can observe the pattern

In second 1²

Third 2³

Fourth 3²

3+1²=4

4+2³=12

12+3²=21

so next is 4³

21+4³=85

85 is the answer