waves travel at a speed of 300m/s through a medium if 10 waves pass through a point per second calculate the frequency​

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

i would say