b. A number is divisible by 8 if it is divisible by 4 and

Question

divisible by 2.

Answer 1

Try them out:

8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96 . . .

Answer 2

Since 8 = 4x2, All numbers divisible by 8 are divisible by 4 and 2.
X/8 = X/(4*2)