The question relates to the number of combinations of 9 students taken 6 at a time:
Answer:
a, c
Step-by-step explanation:
because they have the same equations
3 - x = x³ + x
3 - x - x³ - x = 0
-x³ - 2x + 3 = 0
x = (-b - √(b² - 4ac))/2a
x = (-(-2) - √((-2)² - 4(-1)(3))/2(-1)
x = 1
Answer: Root 3 / 3
Step-by-step explanation: Use unit circle trigonometry.