Question

Find a ⋅ b.

a = 9i - 6j, b = 5i + 5j

Answer 1

if

u = <p, q>
v = <r, s>

then

u ⋅ v = p*r + q*s

Answer 2

Here are the options:
-75

<45, -30>

<14, -1>

15

Answer 3

well you can rule out B and C because the answer should be a scalar (and not a vector)

Answer 4

ok

Answer 5

use the formula I gave you

Answer 6

is it 15?

Answer 7

it is, hopefully you see how to get it

Answer 8

ok. thank you for your help!!!

Answer 9

yw