What is the total displacement of a student who walks 3 blocks East, 2 blocks north, 1 block west and then 2 blocks south

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

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50.)the diagram below represents the wave fronts produced by a point source moving to the right in a uniformmedium. observers are located at points a and b.compared to the wave frequency and wavelength observed at point a, the wave observed at point b has a(1) higher frequency and a shorter wavelength(2) higher frequency and a longer wavelength(3) lower frequency and a shorter wavelength(4) lower frequency and a longer wavelength