Find u*v, if u=13j and v=i+3j

Question

a.-39
b.39
c.(0,39)
d(1,39)

Answer 1

u*v is not the usual notation for vectors

Are you finding the dot product or the cross product?
What is your choice of answer?

Answer 2

I expect you want the dot product, since the cross product will have a k component, and no choice does.
u=0i+13j and v=1i+3j
so, u•v = 0*1 + 13*3 = ...

Answer 3

u= 0i + 13j and v= 1i + 3j
u*v = (0*1) + (13*3)
= 0 + 39
= 39
So, the correct answer is B. 39