Please help me solve

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

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Aline that intersects one of two parallel lines intersects the other also always sometimes never