Simplify $\frac{\log \sqrt{8}}{\log 4-\log 2}$

If $\log 2=x,\log 3=y\text{ and }\log 7=z$ find, in term of x, y and z. The value of $\log (\tfrac{28}{3})$ 

If ${{\log }_{2}}(3x-1)=5$, find x

Simplify $\frac{\log \sqrt{27}}{\log \sqrt{81}}$

Which of these statement about $y=8\sqrt{m}$ is correct?

If $2{{\log }_{x}}(3\tfrac{3}{8})=6$ find the value of x