Answer:
9
Explanation:
Use the Pythagorean Theorem which states
a² + b² = c²
then plug in your given terms
a² + 5.6² = 10.6²
find the squares
a² + 31.36 = 112.36
subtract 31.36 from 112.36 to find your a²
a² = 81
then find the square root of 81, which is 9 becuase 9 x 9 is 81