Solve for x -4.87x -35.39=78.21 x= round to the nearest hundred

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

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Beth makes batches of bluberry muffins and banna muffins. each batchis 6 muffins. she makes 2.5 batches of bluberry muffins. how many batches of bananna muffins should beth make if she wants to have a total of 60 muffins?