Answer:
Step-by-step explanation:
Adding the expressions in the numerator, we get:
6·10^(-5).
Then the given fraction appears like:
6·10^(-5)
-------------
3·10^7
First, we reduce 6/3, obtaining 2:
10^(-5)
2 -------------
10^(7)
Since the bases are the same, we can rewrite these exponentials with that base (10) and single exponent 12, which is the sum of 5 and 7 and is in the denominator:
2
---------
10^12
This matches the second possible answer choice.
