Answer:
Sorry,for the answer it is too difficult brother .
Answer:
-1.2 that is the point hope this helps
Step-by-step explanation:
Use Pythagorean theorem:
9i-j = sqrt (9^2 - 1^2) = sqrt(81-1) = sqrt80
now divide both terms in V by that:
u = 9/sqrt(80)i - 1/sqrt(80)j
see attached picture:
Yes because 84+45 is 129 and 3(28+15) is 129