To find the length of the hypotenuse, we need to use the Pythagorean Theorem. The Pythagorean Theorem states that in a triangle with legs a and b, and hypotenuse c, a² + b² = c². Since we know that the legs are 9 and 13, we can substitute these values into the equation. The equation becomes:
9² + 13² = c²
c² = 81 +169
c² = 250
Now we need to find √250. We can start to do this by finding the prime factorization of 250. The prime factorization of 250 is 5³ * 2. Since we see 5 three times, we can take it out once (because the quotient of 3 and 2 is 1 remainder one, but we don't look at the remainder). That means that the correct answer is: 5√2*5 = 5√10