Respuesta :

Answer:

72.8

Step-by-step explanation:

75^2=5625

18^2=324

5625-324

=5301

square root that =72.8

Answer:

√5301

Step-by-step explanation:

18² + b² = 75²

324 + b² = 5625

(324-324) + b² = (5625-324)

b² = 5301

b = √5301