hi , i suck at these and they’re probably so easy but pls help

Answer:
Your answer would be D) 13.
Step-by-step explanation:
This is really simple. But, I struggled with this as well since middle school. Then I have an amazing math teacher in high school who helped me with this.
12^{2} +5^{2} = 13^{2}
a^{2}+b^{2}=c^{2}
Answer:
13
Step-by-step explanation:
well you will use something called Pythagorean theorem and its literally
a^2 + b^2 = c^2
and from what i see it'll be 13
Plz mark brainliest