Answer:
The lights are not long enough. They need to be about half a foot longer to work.
Step-by-step explanation:
You must use the pythagorean theorem to find the diagonal distance.
[tex]a^{2} +b^{2} =c^{2} \\15^{2} +14^{2} =c^{2}\\225 + 196 = c^{2}\\421 = c^{2\\ = \sqrt{421} =20.518...[/tex]
This shows us that the distance is approximately 20.5 feet. Her lights are not long enough.
