Answer:
8.9
Step-by-step explanation:
[tex]{a}^{2} + {b}^{2} = {c}^{2} \\ {(8)}^{2} + {b}^{2} = {(12)}^{2} \\ 64 + {b}^{2} = 144 \\ \sqrt{ {b}^{2} } = \sqrt{80} \\ b = 4 \sqrt{5} \: or \: 8.9[/tex]
