Express the equation in logarithmic form.
641/3 = 4
41/2 = 2
Just remember that A LOG IS A POWER (or exponent if that is the word you usually use)
$$10^4=1000\quad \rightarrow \quad log_{10}1000=4$$
You can do the others Sally - I think that they are all the same.
If you have problems, ask for more help.