Measurement conversions [metric to metric]
1. 3.68kg= g

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

option number c is the right answer.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle