Question

Find the angle between the two vectors
u=10i+40j
v=-3j+8k
Yes, k, I'm not sure if it's just a book error or it's an actual problem showing that i is zero and that k is zero for u?

Answer 1

i,j,k are just place holders for x,y,x parts

Answer 2

u = <10,40,0>

v = <0,-3,8>

Answer 3

Just making sure, but the book could have always made an error, I emailed my teacher to be 100%

Answer 4

k