The vector A has x, y, and z components of 8.00, 12.0, and ─ 4.00 units, respectively.
(a) Write a vector expression for A in unit–vector notation.
(b) Obtain a unit–vector expression for a vector B one fourth the length of a pointing in the same direction as A.
(c) Obtain a unit–vector expression for a vector C three times the length of a pointing in the direction opposite the direction of A.