To find area $ A $ use formula:
$$ A = 2 l w + 2 l h + 2 w h $$After substituting $ l = 14 $ , $ w = 8.5 $ and $ h = 6.5 $ we have:
$$ A = 2 \cdot 14 \cdot 8.5 + 2 \cdot 14 \cdot 6.5 + 2 \cdot 8.5 \cdot 6.5 $$$$ A = 238 + 182 + 110.5 $$$$ A = 530.5 $$