A block is sitting on a platform 20 m high. It weighs 50 kg. How much potential energy does it contain?

Which of the following is the result of expanding the series

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?

Point a (7,3) is translated to a'(16,-9). which rule describes the translation?