Which are equivalent equations? select two correct answers

Ok so this is a Pythag question...

So the first step would be A squared plus B squared equals C squared

Your A squared would be 12

You do not have B squared value yet

Your C squared Would be 16

So your equation is 12 squared plus B squared equals 16 squared
Simplified that would be 144 plus B squared equals 256
Subtract 144 from both sides and you get 112 equals B squared so do that dividing symbol thing on both sides and you get 10.58 equals c

C= 10.58