Step-by-step explanation:

Answer:
3
Step-by-step explanation:no
Answer:
yes
Step-by-step explanation:

The Quadratic Function has the domain as the set of all real numbers.
For the range, start from minimum value to maximum value.
But because the parabola is downward as a < 0. Thus, there are no minimum value but the maximum value instead.
Therefore the range is y <= -4