Question

HELP WILL GIVE MEDAL
Evaluate the expression.

r = <7, -3, -7>, v = <4, 6, -5>, w = <-5, -6, -3>

v ⋅ w

Answer 1

v.w=<4*-5+6*-6+-5*-3> = <-20+(-36)+(15)> =-41

Answer 2

Thankyou so much! can you help me with more?

Answer 3

ok

Answer 4

i will try

Answer 5

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

u = <-5, 8>, v = <-4, 8>

Answer 6

@AliLnn

Answer 7

costheta = u.v/||v|.||u||
=u.v=84
||v||=sq.rt 80
||u||=sq.rt 89
||v||.||u||=84.3800
costheata=84/84.3800

Answer 8

wait what?