Question

use the logarithm properties to rewrite ln((cubedrt(c))/ab) in terms of r s and t where r=lna, b=lns, and t=lnc

Answer 1

\[\ln(\frac{\sqrt[3]{c}}{ab})\]
\[=\ln(\sqrt[3]{c})-\ln(ab)=\frac{1}{3}\ln(c)-\ln(a)-\ln(b)\] now substitute the numbers you know

Answer 2

or i should say substitute the letter you are given. hope it is clear that
\[\ln(\sqrt[3]{c})=\ln(c^{\frac{1}{3}})=\frac{1}{3}\ln(c)\]