Convert r = 8cos θ to rectangular form. a. x2 + y2 = 8y b. x2 + y2 = 64x c. x2 + y2 = 16x d. x2 + y2 = 8x

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?