Answer:
8.9
Explanation:
according to the Pythagorean theorem:
c^2=a^2+b^2
Where c is the longest side, the hypotenuse, and a and b are the sides.
Substitute the numbers in:
12^2=8^2+y^2
144=64+y^2
144-64=y^2
80=y^2
Y= square root of 80
Y= 8.944
After rounding to the nearest tenth, that would be 8.9