The displacement of a wave traveling in the positive x-direction is D(x, t) = (3.5 cm) sin(2.7x

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The displacement of a wave traveling in the positive x-direction is D(x, t) = (3.5 cm) sin(2.7x - 124t), where x is in m and t is in s.
What are the

(a) Frequency,

(b) Wavelength,

(c) Speed of this wave?

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