I have trouble understanding the question below and I do not really know what linear approximation has to do with this:
Determine how accurate should we measure the side of a cube so that the calculated surface area of the cube lies within 3% of its true value, using Linear Approximation.
Let $A(x)= TSA$; $x=side$
And since we only want the change in $A(x)$ within $3\%$,
From here what can I do? Or am I taking a wrong procedure?