Sections 1.5-1.7-Vector Addition, Subtraction, and Multiplication

1.3 If A = 4a, - 2a, + 6a, and B = 12a + 18a, 8a, determine:

(a) A- 3B

(b) (2A + 5B)/|B|

(c) a X A

(d) (B X a)-a,