Question 1043210
Could you help me solve this please?


<pre>
a) {{{9^(7-3x) =5}}}

b) {{{log0.135}}}       <<<--- To solve it, apply your calculator or computer . . .  Or apply special tables for logarithms, if you have it. 
                               It is the only way in this case.  // The other way is to expand it in series, but nobody will do it in our days.
                               When you ask other people to do it for you, you simply shift/move your work to their shoulders. 
                               It is not a job for tutors. It is your work.
is the answer -0.8696

c) {{{log(7,22)}}}      <<<--- Apply the formula for the base change for logarithms,  {{{log(a,x) = log(b,x)/log(b,a)}}},  and you will get {{{log(7,22)}}} = {{{log((22))/log((7))}}} with decimal logarithms.

                        See the lesson <A HREF=https://www.algebra.com/algebra/homework/logarithm/change-of-base-formula-for-logarithms.lesson>Change of Base Formula for logarithms</A> in this site.
                              
is the answer: 1.588

Thank you so much
</pre>

On logarithms, read the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/what-is-the-logarithm.lesson>WHAT IS the logarithm</A>, 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/Properties-of-the-logarithm.lesson>Properties of the logarithm</A>, 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/change-of-base-formula-for-logarithms.lesson>Change of Base Formula for logarithms</A>, 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/How-to-solve-logarithmic-equations.lesson>Solving logarithmic equations</A>, 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/logarithm/Using-logarithms-to-solve-real-world-problems.lesson>Using logarithms to solve real world problems</A> 

in this site.


You also have free of charge Online textbook on Algebra-I in this site

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-I - YOUR ONLINE TEXTBOOK</A>

in this site.