Answer:
√193
Step-by-step explanation:
7^2 = 49
12^2 = 144
144 + 49= 193
√193 because you are trying to find c not c^2
2.33333333333333333333333333333334
The probability would be

,
Simplify and turn into ratio.
0.159 : 1.
I am unsure what the full question was though.
Hope this helps.