Answer:

Step-by-step explanation:
Use the inverse cosine function.



Answer:
(1,-2)
Step-by-step explanation:
(x,y)transforms(y,-x)at about 270°.
Answer:
it is 20 pairs count them 1 Collin and its 20
The answer would be 17, 990
40 Butterflies at Swallowtail :D