Question 973845
Rewrite log7(151) using base-10 logarithms. Find an apporx. answer rounded to three decimal places. 

I have no idea how to even begin this question because the notes I was given (I do correspondence work at home) don't even mention base 10 logarithms. 
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Base 10 is the default base.  If no other base is given, it's base 10.
The Log button on calculators does base 10.
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For {{{log(7,151)}}} use the base change formula:
{{{log(7,151) = log(151)/log(7)}}}
=~ 2.578
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The log is the exponent.
--> {{{7^2.578 =150.89}}} (not 151 due to round-off error)