8. Vectors

Let $u$ be a unit vector, and let $v$ and $w$ be vectors, where $w$ is also a unit vector. Which of the following statements is true about the dot products $u\cdot v$ and $u\cdot w$?

Which of the following best defines the dot product of two vectors $a$ and $b$?

If $u$ is a unit vector, and $v$ and $w$ are also unit vectors, which of the following is always true about the dot products $u\cdot v$ and $u\cdot w$?