Question

Find a ⋅ b.

a = <7, 4>, b = <3, 5>

Answer 1

A)41

B)<10, 9>

C)-1

D) <21, 20>

Answer 2

Given two vectors \(a=\langle a_1,a_2\rangle\) and \(b=\langle b_1,b_2\rangle\), then the dot product of the two vectors is
\[a\cdot b=a_1b_1+a_2b_2\]

Answer 3

Notice that the answer can't possibly be a vector, thus eliminating B and D as options.

Answer 4

So A?

Answer 5

Yes