how would the mass and weight of an object on the moon compare to the mass and weight of the same object on earth?

they should be similar or the same

d. air pressure decreases as altitude increases.

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