The charge of a system of protons and electrons is + 360e. If the number of electrons is 10, what is the total mass of the system? plz helppp

Objects a and b are visible in the night sky. six months later they are still visible, but object b shows less parallax than object a. which object is closer? a. a b. b c. you would need to wait another six months in order to figure this out. d. you would need to know the objects' angular diameters in order to figure this out.