Question

Let v = (5,-2) and w = (4,10). Which of the following is true? Check all that apply.

a. v x w=20
b. the y-component of w is 10
c. v and w are perpendicular
d. w=-2(-2,-5)

Answer 1

b, c,w are correct

Answer 2

Try them and you see why?

Answer 3

d is correct?

Answer 4

Yes
x(a,b)=(xa,xb)

Answer 5

Cross multiply the two vectors to see if a is correct.