vector A has magnitude of 8 unit and make an angel 45 with the positive x-axis vector B also has the same magnitude of 8 unit and directed along the negative x-axis. Find ,the magnitude and direction of A+B and A-B?

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.