Is this a function ?

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Can someone me and do the problem plz so i can understand it more better

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)