Answer:
4 x 8.5 x 12.5 =425 (multiple hight x width x length)
The volume of the box is 
864 is the answer to the question that you asked just use a calculator
Yes. As long as all four sides connect, it is a quadrilateral
Answer:
y = 6
Step-by-step explanation:
The formula of a slope:

We have the points (-5, 6) and (7, 6). Substitute:

The slope m = 0. Therefore it's a horizontal line y = a.
In the given points we have y = 6.