Respuesta :

the answer is 12
[tex] {13}^{2} = {5}^{2} + {b}^{2} \\ {b}^{2} = {13}^{2} - {5}^{2} \\ b {}^{2} = 169 - 25 = 144 [/tex]
[tex]b = \sqrt{144} = 12[/tex]


good luck