Answer:

Step-by-step explanation:
we know that
If two figures are similar, then the ratio of its volumes is equal to teh scale factor elevated o the cube
Let
z ----> the scale factor
x ----> the volume of the dilated prism
y ----> the volume of the original prism

we have


substitute

solve for x


Answer:
-3
Step-by-step explanation:
as shown in the picture
When the point is reflected across the x-axis,
It becomes (-5,12);
Then it is reflected across y-axis,
The answer should be (5,12)