Answer:
d = -1/2c
Step-by-step explanation:
You want an expression for vector d in terms of vector c.
Vector d
Vector d is half as long as vector c, and is in the opposite direction. "Half as long" is accomplished by multiplying the vector by 1/2. The direction is reversed by multiplying the vector by -1.
d = -1/2c
[tex]\boxed{\vec{d}=-\dfrac{1}{2}\vec{c}}[/tex]
