Question

question in the comments

Answer 1

for the second question i got C, but I'm not sure if it's right.

Answer 2

@jim_thompson5910

Answer 3

somebody please help!

Answer 4

I'll get you started
\[\Large \cos(\theta) = \frac{ \vec{u} \cdot \vec{v}}{|\vec{u}|*|\vec{v}|}\]
\[\Large |\vec{u}|*|\vec{v}|*\cos(\theta) = \vec{u} \cdot \vec{v}\]
\[\Large \vec{u} \cdot \vec{v} = |\vec{u}|*|\vec{v}|*\cos(\theta)\]
\[\Large \vec{u} \cdot \vec{v} = ???\]

Answer 5

30 degrees= u*v/ 2 root3

Answer 6

\[\Large \vec{u} \cdot \vec{v} = |\vec{u}|*|\vec{v}|*\cos(\theta)\]
\[\Large \vec{u} \cdot \vec{v} = 2*\sqrt{3}*\cos(30^{\circ})\]
\[\Large \vec{u} \cdot \vec{v} = ???\]

Answer 7

3

Answer 8

i am not sure if my answer for the second question is right.

Answer 9

please help

Answer 10

what is the value of cos(30)?

Answer 11

.8660

Answer 12

ok as an exact value cos(30) =sqrt3/2

Answer 13

so do what @jim_thompson5910 told you to do