What is 3 x 1/2 ? For my math homework

Multiplying an even number of negative numbers gives an answer that is choose from:

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. b^2 + 4b + 4