which parabola will have a minimum value vertex?

which parabola will have a minimum value vertex?
Answer
Explanation:
Step1: Recall parabola - opening rules
A parabola (y = ax^{2}+bx + c) has a minimum - value vertex when (a>0), which means it opens upwards.
Step2: Analyze the given parabolas
The first three parabolas open downwards (the "U - shape" is upside - down), so their vertices are maximum values. The fourth parabola opens upwards (the "U - shape" is right - side up), so its vertex is a minimum value.
Answer:
The fourth parabola (the one that opens upwards)