Respuesta :
Answer:
225.
Step-by-step explanation:
We have been given some numbers. We are asked to find the number, which is a square.
Let us take square root of each number one by one.
[tex]\sqrt{128}=11.3137084[/tex]; Not a square.
[tex]\sqrt{225}=\sqrt{15^2}=15[/tex]; A square.
[tex]\sqrt{360}=18.9736659[/tex]; Not a square.
[tex]\sqrt{399}=19.974984[/tex]; Not a square.
Therefore, 225 is a square.
