Answer: 8 (The second option).
Step-by-step explanation:
1. To solve this exercise you draw a line to a point O, this lines will bisect the angle of Z∠60°. Then will obtain two into two right triangles with two angles of 30° at the point Z.
2. The lenght XY will be twice the lengt XO or YO.
3. Let's calclate XO as following:

4. Then, XY is:

D. x - 9y + 4 = x + 4 + (-9y)
The answer is an equilateral triangle
Answer:
0
Step-by-step explanation:
all real numbers are solutions