The C(x) equation is a parabola with a squared "x" and a positive leading term coefficient, meaning, is a vertical parabola and it opens upwards
the lowest point, or lowest cost value, it reaches, is the U-turn point, or vertex

so, the lowest cost is at
Answer: The answer is A :)
Step-by-step explanation:
The solution to this equation is n= -49.6.
n/4=-12.4
n/4*4=-12.4 * 4
n= -49.6