Answer:
20
Explanation:
We can use the Pythagorean Theorem to find this: a² + b² = c²
Following that, c² is always the hypotenuse. All we have to do is plug in the variables and solve:
Step 1: Replace variables
12²+16² = c²
Step 2: Solve
144+256 = c²
c² = 400
√400 = √c²
c = 20
And you get x = 20 as your final answer!