C is the answer.
You do 3^x = 10
So x = log_3 (10)
then you do -3x so -3log_3(10) which is:
log_3(1/1000)
Then do 3^(log_3(1/1000))
Due to the property of a^(log_a(b)) = b, we have:
3^(log_3(1/1000)) = 1/1000
So C) 1/1000 is the answer.
