The answer is a= -4.181818
-12 + 3x + 2 = 5x - 10 - 8x
-10 + 3x = -3x -10
-10 + 6x = -10
6x = 0
x = 0
Answer:
Range:35
Mean:27.6
Step-by-step explanation:
Range is the highest number minus the smallest number 40-5=35
Mean is adding up all the numbers,then divide by how many numbers there are 414 divided by 15
Vertex form is

where (h,k) is the vertex.
We can see that the vertex of the graph is at (2,0), and that the graph opens downwards, but does not look stretched at all.
Therefore,
a = -1
h = 2
k = 0
and our vertex form equation is

which is answer A