4 if $log_{8}x$ $=\frac{2}{3}$, then the value of $x$ is : A) $\frac{3}{2}$ B) $\frac{2}{3}$ C) 2 D) 4
6 If log 2 $=x$, log 3 $=y$ and log 7 $=z$, then the value of log $(4.\sqrt[3]{69})$ is : A) $2x+\frac{2}{3}y$ $-\frac{1}{3}z$ B) $2x+\frac{2}{3}y$ $+\frac{1}{3}z$ C) $2x-\frac{2}{3}y$ $+\frac{1}{3}z$ D) $-2x+\frac{2}{3}y$ $+\frac{1}{3}z$
7 If $log_{12}27$ $=a$, then $log_{6}16$ is : A) $\frac{3-a}{4(3+a)}$ B) $\frac{3+a}{4(3-a)}$ C) $\frac{3+a}{(3-a)}$ D) $\frac{4(3-a)}{(3+a)}$
9 If $log(0.57)$ $=\overline{1}$$.756$, then the value of log 57 + log $(0.57)^{3}$ + log $\sqrt{0.57}$ is : A) $\overline{2}$$.146$ B) 0.902 C) $\overline{1}$$.146$ D) 1.902
12 Evaluate the scientific notation of $4.987\times 10^4$ . A) 4987 B) 49870 C) $4987\times 10^4$ D) 4.9870
13 If log m + log n = log(m+n) then m is given by A) $\frac{n+1}{2}$ B) $\frac{n+1}{n}$ C) $\frac{n}{n-1}$ D) None of these