Question

Find the angle between the given vectors to the nearest tenth of a degree.

u = <6, -1>, v = <7, -4>

Answer 1

I explained the same thing to someone here yesterday
let look for the link

Answer 2

I have gotten to 46/ (sqrt37 x sqrt65)

Answer 3

here, see how to do this
http://openstudy.com/study#/updates/53dd9cc7e4b05346a5838d1e

Answer 4

Then you almost solved it

Answer 5

So what is the problem?

Answer 6

I keep getting 4.5 and that is not one of the answer choices

Answer 7

because you are using radians not degrees?

Answer 8

I do not understand the costheta part

Answer 9

Did you use the Arccos?

Answer 10

well where did you get 46/ that two roots? did you not use the costheta?

Answer 11

i did u dot v / absolute value u and absolute value v

Answer 12

u dot v= |u||v|costheta
not jut |u||v|

Answer 13

thats the part I dont get

Answer 14

when you do the dot of two vectors there is an angle between them
Actually that is the angle you're trying to find here