7.5
-11 + 26 is 15. 15 divided by 2 (finding the midpoint of the two numbers) is 7.5.
You got it wrong again it is c. you can see this because it is the only one that has two negative numbers like the expression.
The answer is about 1.9166
If you're taking 0+4=y^2
It would be y^2=4
And then you take the square root or four which is 2.
So y=2