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**afeasfaerw23231233** question: With respect to an origin, O, the points A, B and C have position vectors (2i+5j)m, (-i+2j)m and (7i+15j)m respectively.

(a) Express vector BA, in terms of i and j.

(b) Given that P is the point on BA, between B and A, such that BP/PA =1/2

Write down vector BP, in terms of i and j

(c) Hence, or otherwise, find vector OP, in terms of i and j.

my ans:

(a) -3m(i+j)

(b) -m(i+j)

(c) 3mj

book's ans:

(a) 3i+3j

(b) i+j

(c) 3j

i have no idea where all the 'm' goes