<span>They must sell 1200 yearbooks to break even hope this helped</span>
Answer:

Step-by-step explanation:
The Law of Cosines gives an immediate result. No translation to Cartesian coordinates is necessary. That law makes use of the angle between the vectors, u2-u1

Your question is not clear, if you are asking: what is

simplified? Then the answer is

or

.
If 63 is just the question number and you are asking, what is

simplified. Then the answer is

or

You get this answer by finding the highest number that both the numerator and denominator are divisible by, and diving both numbers by that: