Question

Find a ⋅ b.

a = <7, 4>, b = <3, 5>
41
<21, 20>
<10, 9>
-1

Answer 1

What are the instructions for this problem?

Answer 2

find a * b so i got 41. is that correct

Answer 3

For the dot product, a*b = 7 · 3 + 4 · 5 = 21 + 20 = 41

is what I got which is the same as yours.

Answer 4

can i ask 1 more question

Answer 5

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

u = <2, -4>, v = <3, -8>
3.0°
6.0°
16.0°
-7.0°

Answer 6

On the second part of the first problem, <21, 20>* <10, 9>, I did not get -1 for the dot product.

Check your work on that. @naveenbhatia1312

Answer 7

i did not either. I got 41

Answer 8

Okay, so the first problem is just one problem, then.

Hold on while I look for the angle.

Answer 9

cos(x) = .994505

x = 6.0° --> Did you get this?

Answer 10

yes

Answer 11

thanks

Answer 12

You are welcome.