20x=53-13
20x=40
20x/20=40/20
x=2
'B' and 'D' are correct.
'C' isn't, and we don't know about 'A' because you left it out.
V = (-7,-4)
8v would be 8 times both numbers
8v = (8*-7, 8*-4)
8v = (-56, -36)
magnitude = square root( -56^2 + -36^2)
= sqrt(3136 + 1296)
= sqrt(4432 )
= 4 sqrt(277)
It has to be the first one
Divide them both by 6
So it should be : 3/4
