Question

Need help with pre-calculus will give owl bucks
Screen shot below

Answer 1

Number 11 only

Answer 2

can you tell me the vector from A to B?

Answer 3

The slope?

Answer 4

A is (4,0)
B is (2,1)

What do you have to add to the x coordinate of A to get the x coordinate of B?
What do you have to add to the y coordinate of A to get the y coordinate of B?

Those two numbers, in order, are the vector from A to B.

They are not, however, the UNIT vector in that direction, as the magnitude of the vector is not 1. You do have to first find the vector from A to B to find the unit vector...

Answer 5

-2,1 omg u jsut saved my life!

Answer 6

Okay, so that's the vector from A to B. The magnitude of that vector is found by squaring both components, adding them, and taking the square root:

\[m = \sqrt{x^2+y^2}\]

Answer 7

What do you get for the magnitude of the vector <-2,1>?

Answer 8

Sqrt 5

Answer 9

good. so to get a unit vector, we want the same direction, but the magnitude to only be 1. we can accomplish that by dividing our vector by its magnitude, which gives us

<-2/sqrt(5), 1/sqrt(5)> or after normalization, <-2 sqrt(5)/5, sqrt(5)/5>

Answer 10

Oh wow that was easy i fugred out B aswell , including A with your help ! Thank you

Answer 11

you're welcome!

Answer 12

I have sent you an owlbuck

Answer 13

thanks!