Answer:
0.012
Step-by-step explanation:
Linear approximation says that,

For a cube the surface area is
.
So the side is 1.0 inch in, the surface area is
square inches.
In Linear approximation means you ignore the term
, if
is a small number, because then
will be a very smalle number and that does not contribute much to the error.
So the surface area is approximately,

So here, 
The error in the area is approximately,

So the error is 0.012.
Each side of the board would have to be at least 36
<span>denominator is </span>number below the line in a common fraction.
Here's picture to show what is a denominator:
The answer for part a would be 130
the answer for part b would be 60