Which expressions are equivalent to z + (z + 6)

Choose all answers that apply:

(Choice A)

A

(z+z) + (z+6)

(Choice B)

(z+6) + 6

(Choice C)

C

2 (z+3)

What is the factored polynomial 3n^2-48

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a sun in a distance galaxy has an estimated mass of 1.61244 * 10 ^32 kg and the earth has a mass of 5.972 * 10^24 kg, how many earths would it take to equal the mass of the sun?