**Problem : **
What is the difference between a vector and a ray?

**Problem : **
A vector has origin at (1,2) and endpoint at (-3,-4). What is the horizontal,
or *x*-component of this vector?

**Problem : **
How many vectors are needed to form the coordinate plane?

**Problem : **
A vector has origin at (-3,5) and endpoint at (0,8). What is the magnitude of
this vector?

**Problem : **. .
What is
3?

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