Question

Find a ⋅ b.

a = <5, 2>, b = <4, 5>

Answer 1

multiplying vectors?

Answer 2

Dot product is when you take corresponding components (so 5&4; 2&5) and multiply them together. Then add these products.

Answer 3

same as do
http://www.mathskey.com/question2answer/16897/find-a-b-a-5i-7j-b-4i-3j

Answer 4

essentially you're doing (5*4)+(2*5)

Answer 5

30

Answer 6

20,10

Answer 7

add two =30

Answer 8

oh so after i multiply them im suppose to add them

Answer 9

\[a\cdot b = \sum a_ib_i\]
In your case, a = <5, 2>, b = <4, 5>, so,
\[a\cdot b = a_1b_1+a_2b_2 = 5(4) + 2(5) = ...\]

Answer 10

Note:
a = <\(a_1, a_2, ...\)>
b = <\(b_1, b_2, ...\)>