91Ó°ÊÓ

We have seen that in 2009 , the United States government spent more than it had collected in taxes, resulting in a budget deficit of \(\$ 1.35\) trillion. In Exercises \(139-142\), you will use scientific notation to put a number like 1.35 trillion in perspective. The Washington Monument, overlooking the US. Capitol, stands about 555 feet tall. Stacked end to end, how many monuments would it take to reach 1.35 trillion feet? (Note: That's more than twice the distance from Earth to the sun.)

Use the motion formula \(d=r t,\) distance equals rate times time, and the fact that light travels at the rate of \(1.86 \times 10^{5}\) miles per second, to solve Exercises \(143-144\) If the moon is approximately \(2.325 \times 10^{5}\) miles from Earth, how many seconds does it take moonlight to reach Earth?