If x = 45, solve for y y = 5/9 x

Can someone me with the property questions for 12 13 and 14 plz

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)

Precalculus question, image attached.