if anyone knows how please help a little..?

Question

i have a huge test that i am trying to prepare for. However there are many problems about Vectors, which i do not get al all. i will give you just a few example of the different kinds of questions, if anyone know how to do any of these please help.. thanks a billion.

oh by the way this isn't my homework its just practice problems that i'd like to learn how to do before my test comes. thanks again.

1.A quantity with both a magnitude and a direction is called a
Scalar
Vector
Number
Unit


2. Vector A has a magnitude of 9 and points due north, vector B has a magnitude of 3 and points due north, and vector C has a magnitude of 5 and points due west. What is the magnitude of the resultant vector A+B+C?
20
13
15
11


3. The components of vectors are considered
Vectors
Scalars
Units
Numbers


4. A person walks 3.0 km northeast, then 1.0 km east, and finally 4.0 km south. Calculate the distance from the starting point to the finishing point of the walk

Answer 1

1. They are vectors--you probably knew that one.
2. 13 it is a square triangle of 12 North and 5 West--Pythagorus teaches us that the answer to your question is 13.

3. I think I would call them units, but I am not really sure on that one.

4. Draw it on graph paper. It would be easy if it wasn't 3km NE.

Hope that helps.