Check whether or not the following are composite numbers: $39, 47, 57, 69, 83, 93, 103$

Check whether the given number is even or not: $9$

Check whether the given number is even or not: $16$

Verify the distributive property for multiplication of the following:

$a\times \left(b+c\right)$, where $a= 28, b= 15, c=12$.

Verify the distributive property for multiplication of the following:

$a\times \left(b-c\right)$, where $a= 28, b= 15, c=12$

Check whether the following pair of numbers is co-prime.

$20, 25$

Check whether the following pair of numbers is co-prime.

$18, 35$