If x is a natural number such that x ≤ 4. Hence, x can take values equal to 1, 2, 3, 4 i.e 4 values.
If x is a natural number such that 3 ≤ x ≤ 9. Hence, x can take values equal to 3, 4, 5, 6, 7, 8, 9 i.e 7 values.
If x is a natural number such that x ≥−1 & x ≤ 6. Hence, x can take values equal to 1, 2, 3, 4, 5, 6 i.e 6 values.