Not sure what simp lies firm is
The axis of symetry, or A.o.S, intersects a parabola at its vertex. The answer is x=1
Answer: All real numbers
Step-by-step explanation: If you plug in any number, it will work. 4(a+3) = 12+4a. a=-3 0=0
Volume =

The answer is the first option.
Hope this helps. - M