How many hours would be required to make a 3700 km trip across the United States if you average 70 km/h?
 _____ h

What is the height of the National Debt in pennies stacked on top of each other. Suppose these pennies were distributed uniformly across the land area of the contiguous 48 states. What distance would separate each penny from its nearest neighbor? How many tons of copper would be required to make these pennies? Suppose they were distributed by dropping them from the sky. If you were standing outside, how many pennies would hit your head, on average? If you stuck your finger straight up. what is the probability that a penny would land on it? and stick?