Can someone tell me if im correct on this and if not then can u tell me what the correct anser is? I will give brainliest

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)

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)