Answer:

Step-by-step explanation:
First, find the magnitude of the vector:

Then, divide each component of the vector by the magnitude to get the unit vector and rationalise:

Answer:
The first choice
Step-by-step explanation:
So you see that square down there, does mean that the angle is 90 degrees. So 90-50 = 40 so yea the first choice.
Answer:
14/15
Step-by-step explanation:
Find common denominators. Note that what you do to the denominator, you do to the numerator.
Use 15 as the common denominator:
(-2/5)(3/3) = (-6/15)
(4/3)(5/5) = (20/15)
Combine like terms:
-6/15 + 20/15 = (20 - 6)/15 = 14/15
14/15 is your answer.
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Answer:
10
Step-by-step explanation:
5C2 =<u>5!</u>
2! (3)!
=<u>1 x 2 x 3 x 4 x 5</u>
(1 x 2) (1 x 2 x 3)
=<u>4 x 5</u>
2
=<u>20</u>
2
5C2 = 10