A200 kg boulder has 39,200 jars of gravitational potential energy what height is it at

At a book fair, joe bought 24 books at 3 for $5 and had $2 left. how much money did he have at first?

Simplify each expression for 18, 20, and 21

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u. s., china, germany. b) the u. s., china, japan. c) china, the u. s., japan. d) china, the u. s., germany.