Answer:
y=13
Explanation:
The pythagoram theorm states that a^2+b^2=c^2, c being the hypotenus
If we input the values from the triangle we get the equation
12^2+5^2=y^2
simplify
144+25=Y^2
169=y^2
To get the value of y, take the root of both sides
√169=√y^2
13=y