Answer
$\approx 9.15°$
Work Step by Step
There are $60$ seconds in $1$minute.
Hence
$9"=\frac{9}{60}'=0.15'$
Hence
$9°9'9"=9°(9+0.15)'$
$=9°9.15'$
There are $60$ minutes in $1$ degree.
Hence
$9.15'=\frac{9.15}{60}°=0.1525°$
Hence
$9°9'9"=(9+0.1525)°$
$\approx 9.15°$ (to two decimal places)