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Answer:
n=4
a=36.82
Step-by-step explanation:
[tex]90+53.18+a=180[/tex]
[tex]a+143.18=180[/tex]
[tex]a=36.82[/tex]
[tex]n^2+3^2=5^2[/tex]
[tex]n^2+9=25[/tex]
[tex]n^2=16[/tex]
[tex]n=4[/tex]