If a rope with linear mass density .167kg/m and is 4m long, what are the lowest four frequencies of standing waves possible on such a rope? What is the fundamental frequency?

Answer 1

what does linear mass density have to do with wavelength?

wavlength=1/2 length if fixed on both ends.

Harmonics? see this...
http://www.physics.isu.edu/~hackmart/spl1sws.pdf