Write the expression as a single natural logarithm. 3ln3 + 3lnc
a. ln(27 + c^3)
b. ln9c^3
c. ln27c
d. ln27c^3

Using the rules of logarithms, you can change it to 

ln() + ln() = 

ln(27)

This is because when you have a factor in front of a logarithm, that turns into an exponent, and when you add logarithms, you multiply the factors inside of the logarithm.  

So your final answer is D.