Vector Addition Homework: Magnitude and Angle Calculations

[HeroicEdge]

Homework Statement

Two vectors are given by a = 2.3 x - 9.7 y and b = -18.6 x + 2.8 y. What is the magnitude of a?

What is the angle between vector b and the positive x-axis?

What is the magnitude of the vector a + b?

Homework Equations

I don't know

The Attempt at a Solution

None. I don't need the answer I just need to know like the steps to do it. I missed a class and don't have a book so I don't know how to do this >.< Any help is appreciated.

 

[gneill]

Homework Statement

Two vectors are given by a = 2.3 x - 9.7 y and b = -18.6 x + 2.8 y. What is the magnitude of a?

What is the angle between vector b and the positive x-axis?

What is the magnitude of the vector a + b?

Homework Equations

I don't know

The Attempt at a Solution

None. I don't need the answer I just need to know like the steps to do it. I missed a class and don't have a book so I don't know how to do this >.< Any help is appreciated.

A web search will turn up lots of resources for vectors and vector operations. Here's an example: http://www.physicsclassroom.com/class/vectors/u3l1b.cfm