Answer
$$100.4 \ in^2$$
Work Step by Step
We know the following equation:
$$ A= w \times l$$
Thus, for the laptop:
$$ A = 12.9 \times 9 \\ A = 116.1 \ in^2$$
For the phone:
$$ = 5.6 \times 2.8 \\ = 15.7\ in^2$$
Thus, the difference is:
$$ = 116.1\ in^2 - 15.7 \ in^2 \\ = 100.4 \ in^2$$
