Final answer:
A function with a degree of 4 and a negative leading coefficient has an even degree and opens downward. So the correct answers are Option A and B.
Step-by-step explanation:
Given that a function has a degree of 4 and a negative leading coefficient, several characteristics can be determined:
- The function has an even degree (Answer A).
- The function opens downward (Answer B).
Since the leading coefficient is negative, Answer C (the function has a positive leading coefficient) is incorrect. Answer D (the function has an odd degree) is also incorrect because the degree is 4, which is even. Lastly, Answer E (the function opens upward) is not accurate either due to the negative leading coefficient.