Mohon bantuannya tentang vektor vektor

vektor a (2, -1)
vektor b (6, -2)
vektor c (0, -2)
a) vektor a . vektor b = (2, -1) . (6, -2) = 12 + 2 = 14
b) vektor a . vektor c = (2, -1) . (0, -2) = 0 + 2 = 2
c) vektor a . (vektor b + vektor c) = (2, -1) . ((6, -2) + (0, -2)) = (2, -1) . (6, -4) = 12 + 4 = 16