Fast how does multiplying a vector by a scalar value of -pi/4 change the vector?

A vector has length (magnitude) and direction.

Multiplying a vector by a scalar can alter both its length and its direction.

Specifically, you are multiplying by .
When you multiply a vector by a negative as in this case the direction changes.

Next when we multiply by a quantity greater than 1 the vector's length increases. When we multiply by a quantity less than 1 the vector's length decreases. Here you are multiplying by a quantity less than 1. For the sake of getting an estimate pi is approximately 3.14 so dividing that by 4 gives you a quantity less than 1.

So multiplying by will have the following effects on the vector:
It will face the opposite direction and it will be shorter (have less magnitude). Specifically the magnitude will be of what it was before.

29. because you will divide each number of months by 12 to find the number of years. which would mean, 5, 12.5, 16, 45, 50, 72.5. which is crazy. anyhow, i think you find the median in the middle. and yea hope your test goes good