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Please help ASAP due tomorrow

Please help ASAP due tomorrow-example-1

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right triangle, so one angle = 90 and sum of the other 2 angles = 90
so
71x - 1 + 20x = 90
91x = 91
x = 1

<A = 20(1) = 20

answer
<A = 20 degrees
User Loonis
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