Let's start by comprehending the given data. The thickness of a single one dollar bill is 0.0001 meters, and the expenditure is 4 trillion dollars. 1 trillion is expressed as 10¹². Therefore, 4 trillion would be 4 times 10¹² which is 4*(10¹²).
A stack of these bills means we are piling each one dollar bill on top of another. By doing this, the thickness of each bill is added up, creating a tower of dollar bills.
For finding the total height of this stack, we multiply the thickness of a single bill by the total number of bills, which is our expenditure. That is:
Total thickness = expenditure * bill thickness
Replacing these with the values we have:
Total thickness = 4*(10¹²) * 0.0001 = 400,000,000.0 meters
Therefore, a stack of 4 trillion one dollar bills would be 400,000,000.0 meters tall.
We can express this into scientific notation. The scientific notation for 400,000,000.0 ends up being 4.0 x 10^8.
So, the stack of 4 trillion one dollar bills would be 4.0 x 10^8 meters tall.