Respuesta :

a) is 2x
b) is [tex]x^{3}[/tex]
c) is -2x

I think these are correct.
[tex]log_{10}1000^{x] = log_{10}10^{2x}=2x[/tex]
I did similar things to get other answers
[tex]1000^{log_{10}x} = 10^{3log_{10}x}=10^{log_{10}x^{3}}=x^{3}[/tex]