I worked these math problems out, however the system says they are incorrect. I would appreciate it if you could please check over my work, and maybe even tell me where I went wrong:

$\displaystyle 1.$ $\displaystyle ln(a)=2 , ln(b)=3 , ln(c)=10 $

$\displaystyle \frac{ln(a^{-2}b^1)}{ln(bc)^1}$

$\displaystyle -2ln(a)+1ln(b)-1ln(b)-1ln(c)$

$\displaystyle -2(2)+1(2)-1(3)-1(5)$

$\displaystyle 9$

$\displaystyle 2.$ $\displaystyle ln(a)=2 , ln(b)=3 , ln(c)=10 $

$\displaystyle ln(c^{-4})*ln(\frac{a}{b^{-4}})^4$

$\displaystyle -4ln(c)+4ln(a)+16ln(b)$

$\displaystyle -4(5)+4(2)+16(3)$

$\displaystyle 36$