If a one dollar bill is 0.0001 meters thick, how many meters tall would a stack of 4 trillion one dollar bills be? Write your answer in scie

.0001  =  1 x 10^-4  meters  ...  and 4 trillion = 4  x 10^12. ......so....

(1 x 10^-4 ) meters  x  (4 x 10¹² )   =  4 x 10⁸  meters 

If a one dollar bill is 0.0001 meters thick, how many meters tall would a stack of 4 trillion one dollar bills be? Write your answer in scientific notation. For reference: 1 trillion =10^12 ​ ​​

$$4*10^8 \\\\
= 400,000,000\;metres\\\\
=400,000\;km$$

That is a long way.   That is how far it is to the moon!!