Select the correct answer.
What are the roots of this quartaic equation? -x^2+12x-9=0

Select the sequences that are geometric.

The area of a circle is equal to 1 dm². find the radius of the circle.

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?