Question 166858
Log ( 1/10^-3) + log 10^4 = 
Same as:
{{{log((10^4/10^-3))}}}
Reciprocal gets rid of the negative exponent
{{{log((10^3*10^4))}}}
{{{log(10^7)}}}
we know the log of 10^7 = 7;
 10^7 = 10,000,000