Answer:
12^3/12^7= 1/12^(7-3)= 1/12^4
Step-by-step explanation:
The exchange rate can be expressed as: 60 dollars / 50 euro
So 60 euros * 60 dollars / 50 euro = 60 * 60 / 50 dollars (the euros cancel out)
= 3600 / 50 dollars
= 360 / 5 dollars
= 72 dollars

Notice that if

, then

. Recall the definition of the derivative of a function

at a point

:

So the value of this limit is exactly the value of the derivative of

at

.
You have