Question

If u=10i+9j and v=91-4j find u.v

Answer 1

I think its dot product

Answer 2

I am pretty sure that he is referring to vectors

Answer 3

oh LOL my bad.....

Answer 4

@csmith0355 The dot-product of two vectors \(\bf \vec u=(u_{1},u_{2})\) and \(\bf \vec v=(v_{1},v_{2})\) is given by:\[\bf \vec u \frac{}{} \vec v=u_{1}v_{1}+u_{2}v_{2}=|\vec u||\vec v|\cos(\theta)\], where theta is the angle between the vectors.

Answer 5

Yeah,.... i'm not familiar with this stuff yet :(

Answer 6

Sorry if i confused you.

Answer 7

To start you off, I will reveal the following information/hints to you:\[\bf u=10i+9j=[10,0]+[0,9]=[10,9]\]@csmith0355 Is the second vector v = 91 - 4j?

Answer 8

@csmith0355

Answer 9

i got 54

Answer 10

and yes this is vectors sorry 4 the late response