Logarithms

What is the value of [tex] \log_3 81 [/tex]?

Which of the following is correct?

If [tex] \log_2 a=b [/tex], then what is the relation between [tex] a [/tex] and [tex] b [/tex]?

What is the value of [tex] \log_{\frac{1}{2}} 4 +\log_5 {\frac{1}{5}} [/tex]?

[tex] \log_{10} 2x =1[/tex]
Find [tex]\log_2(x+3)[/tex]

[tex] \log_3 {\frac{x}{2}} -\log_3 2=-\log_{\frac{1}{3}} 9 [/tex]
What is the value of [tex] x [/tex]?

What is the value of [tex] 1 +\log_3 15 -\log_3 5 [/tex]?

[tex] \log_{10} 2=0.3 [/tex] and [tex] \log_{10} 3=0.48 [/tex]
What is the value of [tex]\log_{10} 36 [/tex]?

If [tex] \log_{10} 2 =b [/tex], then what is the value of [tex] 2^{\log_{10} x} [/tex]?

[tex]\log_b a=\frac{2}{3}[/tex]
What is the value of [tex]\log_a b [/tex]?