Answer:
0.143059384
Step-by-step explanation:
=> 
=> 
=> 
=> 
=> 0.143059384
The slope is -2. You find this by putting the rise between the two points over the run.
7.5 pi ft
Hope this helps! :)
The surface area of the box will be 112 in²
Explanation
According to the given diagram, the shape of the box is Right Rectangular prism.
The formula for the surface area is :
, where
length,
width and
height of the rectangular prism
Given in the diagram that, 
So, plugging the values into the formula...

So, the surface area of the box is 112 in²