Find the missing number:
1, ?, 9, 16, 25

The answer is 4

Step-by-step explanation:

The missing number is 4

Looking at the sequence it represent perfect squares

1 × 1 = 1

3 × 3 = 9

4 × 4 = 16

5 × 5 = 25

The formula is therefore n²

Here n = 2, n² = 2² = 2 × 2 = 4

4

Step-by-step explanation:

(1)² = 1

(2)² = 4

(3)² = 9

(4)² = 16

(5)² = 25

a 8

Step-by-step explanation:

4x8=32

5x8=40

7x8=56

9x8=72 hope this helps