Question 1091007
<br>There is nothing complicated about this except the notation.  You just need to make sure you start with the innermost parentheses -- which means you work from right to left to evaluate the given expression.<br>
As for the notation, let me use F and G for the inverses of the two given functions.<br>
And of course you need to know that<br>
{{{f(x)=x+2}}} --> {{{F(x)=x-2}}}
and
{{{g(x)=x/3}}} --> {{{G(x)=3x}}}<br>
Then...
{{{f(19)=21}}}
{{{g(21)=7}}}
{{{F(7)=5}}}
{{{F(5)=3}}}
{{{G(3)=9}}}
{{{f(9)=11}}}<br>