Question

A wave with an amplitude of 31 mm interferes with another wave that has the same wavelength, an amplitude of 13 mm.

a) What is the maximum amplitude of the resultant wave if the two waves are in phase?

b) What is the maximum amplitude of the resultant wave if the two waves are out of phase?

Please show your work
max amplitude: add the waves
max 180 out of phase: subtract .
I don't understand the second part. What do you mean by max 180 out of phase: subtract?

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