Round 55580.5 to 2 significant figures

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

Can any one me with the answers to these questions asap?