Answer:
n = 8
Step-by-step explanation:
[tex]m \angle 1 = 9n \\ m \angle \: 2 = n + 10 \\ \\ \because \: m \angle 1 + m \angle 2 = 90 \\ \therefore \: 9n + n + 10 = 90 \\\therefore \: 10n = 90 - 10 \\ 10n = 80 \\ n = \frac{80}{10} \\ \huge \red{ \boxed{ n = 8}}[/tex]
