Answer:
C) (7.1)^13
Explanation:
When you multiply numbers with the same bases but different exponents, the base stays the same, but the exponents get added:
a^x*a^y=a^(x+y)
(7.1)^6*(7.1)^7=(7.1)^(6+7)=(7.1)^13
Therefore, the correct answer is C) (7.1)^13