Answer:
Step-by-step explanation:
The laptop screens are measured diagonally. Meaning a 13 the laptop has a distance of 14 inches from one corner to the other.
Therefore, to find the width of the laptop screen, we use Pythagoras's theorem.

Now subtracting 7^2 from both sides gives


taking the square root of both sides gives

the radical on the right can be simplified to give

which is our answer!
Hence, the laptop screen is 7√3 inches wide.