Hey there ! please refer to the attachment .
I hope its help you !
Answer: 16, rational
Step-by-step explanation: because its a real number
X=12. you just have to Square root 144.
We know that an equilateral triangle has all sides equal.
Initial perimeter = s + s + s = s
Each side has been increases by then the new perimeter is:
(s+15) + (s+15) + (s+15) = 3s + 45
So the new perimeter = 3s + 45
......................all good?