Please help with these two problems and give an accurate explanation. Thank you!

Somone me i want to know what 18 hours out of 24 hours in a fraction

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)

Factor the polynomial expression x6 – x3 – 20