Explicación paso a paso:
1. I. a + 10 = 90
a = 80
II. B + 50 = 90
B = 40
III. o + 80 = 90
o = 10
2. 36 + 3x = 90
3x = 54
x = 18
3. 5n + 10n = 90
15n = 90
n = 6
6^2 = 36
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Explicación paso a paso:
1. I. a + 10 = 90
a = 80
II. B + 50 = 90
B = 40
III. o + 80 = 90
o = 10
2. 36 + 3x = 90
3x = 54
x = 18
3. 5n + 10n = 90
15n = 90
n = 6
6^2 = 36