Answer:
200
Step-by-step explanation:
log a is the same thing as: [tex]log_{10}{a}=b[/tex] which can be rewritten as [tex]10^b=a[/tex] and in general logarithms are in the form [tex]log_ba=c[/tex] which can be written as [tex]b^c=a[/tex]
Rewrite into exponential form
[tex]10^3=5x[/tex]
Simplify exponent
[tex]1000=5x[/tex]
Divide by 5
x=200
