Question 1006069
C and D functions for each county.  D(x)=x+34  converts size x  from county to the value in county D.  You want D(x) and C(x) to be inverses.


{{{D(C(x))=C(x)+34=x}}}-----be sure this makes sense before continuing.



{{{highlight(C(x)=x-34)}}}



Check if this works.
Size 3 in county C is what in county D?
{{{3+34=37}}}.
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Size 37 in county D is what in county C?
{{{37-34=3}}}.
Check is good.