Help im horrable at math

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

What is the solution set of the quadratic inequality x^2-5< or equal to 0

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)