Respuesta :

Answer:

[D] 13.9

Explanation:

  • Pythagorean theorem: a² + b² = c²
  • Solve for hypotenuse (side x) using: c = √a² + b²

12.8² + 5.3² = 191.93

√191.93

= 13.8538803229

Round the answer

13.9