6. A quantity that is described by both magnitude and direction is called a __________.

magnitude
vector
reference point
scalar
B?

right

The correct answer is "vector."

To arrive at this answer, we can analyze the options given:

1. Magnitude: While a vector has magnitude, it is not solely described by magnitude alone. It also includes direction.
2. Vector: This option is correct. A vector is a quantity that is described by both magnitude and direction.
3. Reference Point: This term refers to a specific point used as a starting point or comparison in measurements, but it does not describe a quantity with both magnitude and direction.
4. Scalar: Scalar quantities have magnitude but do not have direction.

Therefore, the correct answer is "vector."