The answer is below hope it helps.
Answer:
The vertex form of a quadratic function:
(h,k) - the coordinates of the vertex
If a>0, then the parabola opens upwards, so the vertex is the minimum of the function.
If a<0, then the parabola opens downwards, so the vertex is the maximum of the function.
Answer:
The answer for this question would be maybe D-
SORRY IF I'M WRONG
Think of sea level as 0 on number line
-13 + 6 - 15