Answer:
There's two answers.
-5, -4, and -3
3, 4, 5
Step-by-step explanation:

The bird laid 6 eggs since only 1/3 hatched, one can multiply 2 by 3 to get 3/3 of the eggs which would equal 6.
Since Nancy wants a fence around her backyard, we are obviously talking about perimeter here.
10 + 10 + 15 + 15 = 50
The perimeter of her backyard is 50 meters
50 x 10 = 500
It would cost her $500