Four sound waves are to be sent through the same tube of air, in the same direction: What is the amplitude of the resultant wave?

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s1(x, t) (9.00 nm) cos(2 mx - 700mt) s2(x, t) = (9.00 nm) cos(2 mx - 700mt + 0.7m) s3(x, t) = (9.00 nm) cos(2 mx - 700 mt + 7) S(x, t) = (9.00 nm) cos(2 x - 700 rt + 1.77). %3D