Verified Answer :

TSO

Simply plug in \(\sf{z=15.9}\) into \(\sf{\frac{z-6}{3}}\)

So:

\(\sf{\frac{15.9-6}{3}}\)

Simplify that more:

\(\sf{\frac{9.9}{3}}\)

And that finally becomes 

\(\sf{3.3}\)

So when \(\sf{z=15.9}\) the answer will be \(\boxed{\sf{3.3}}\)

(z-6) turns to (15.9-6) which is 9.9 then divide that by 3 and you get 3.3

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