Answer:
see attachment
Step-by-step explanation:
The complex numbers in this table are the ones where a negative number is under the radical. The attachment has these circled.
Answer: 10
Step-by-step explanation: We can just count the number of vertices in the star and each vertex makes an angle. There are ten vertices in a star and thus ten angles.
Cos x = 15÷17
because cos is adjacent side over hypotenuse.