Answer:
Q9. C.
Q10. B.
Step-by-step explanation:
[tex]\bold{Q9.}\\\\\dfrac{3}{14}=3:14\approx0.214=0.214\cdot100\%=21.4\%\\\\\bold{A.\ NOT}\ 7\%<21.4\%\\\bold{B.\ NOT}\ 10\%<21.4\%\\\bold{D.\ NOT}\ 20\%<21.4\%\\\\\bold{C.\ YES}\\\\\dfrac{4}{15}=4:15=0.2\overline{6}>0.214\\\\6\times10^{-1}=6\times\dfrac{1}{10}=6\times0.1=0.6>0.214\\\\\dfrac{11}{50}=11:50=0.22>0.214[/tex]
[tex]\bold{Q10.}\\\\\text{The scientific notation:}\ a\times10^k,\ \text{where}\ 1\leq a<10,\ \text{and}\ k\in\mathbb{Z}.\\\\0.000038=0.\underbrace{00003}_{5\to}8=3.8\times10^{-5}\\\\0.000038=3.8\times0.00001=3.8\times0.1^5=3.8\times10^{-5}[/tex]
