Question 1076859
.
There is NO vertical shift.


Or, in other words, vertical shift is equal to zero.


See the illustrative plot below.



{{{graph( 600, 330, -20.5, 20.5, -120.5, 120.5,
          100*sin((pi/9)*(x+4))
)}}}


Plot y = {{{100*sin((pi/9)*(x+4))}}}