Help needed ASAP! Due very soon

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)

Select the number of ways in which a line and a circle can intersect

Which of the following vectors are orthogonal to (2,1)? check all that apply