Please let me know if there is any mistake
This is a simple plug in type question,
The resultant displacement is given as
y(x,t) = (27)sin(7.54t - 1.52x) + (33)sin(2.94t + 0.404x)
Now, just put given value of t and x for each case
for t = 2.80 and x = 2.27 ,
y(x,t) = (27)sin(7.54*3.14*2.80 - 1.52*3.14*2.27) + (33)sin(2.94*3.14*2.80 + 0.404*3.14*2.27)
y(x,t) = -23.9544 - 14.466
y(x,t) = - 38.42 m
-----------------------------------------------------------------------
now, for t = 2.80 and x = 2.93
y(x,t) = (27)sin(7.54*3.14*2.80 - 1.52*3.14*2.93) + (33)sin(2.94*3.14*2.80 + 0.404*3.14*2.93)
y(x,t) = 24.05 -31.71
y(x,t) = -7.666 m
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