A wave on a string is described by D(x,t)=(2.4cm)× sin[2π(x/(3.6m)+t/(0.18s)+1)], where x is in m and…

A wave on a string is described by D(x,t)=(2.4cm)×
sin[2π(x/(3.6m)+t/(0.18s)+1)], where x is in m and t is in s.
-What is the frequency?
-At t=0.45s, what is the displacement of the string at
x=0.30m? D( 0.30m, 0.45t)= ?