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Cerrena [4.2K]
3 years ago
7

Idek how to start please help

Mathematics
1 answer:
sp2606 [1]3 years ago
6 0

First, note that x+21 and 3x+9 are "complementary angles;" they add up to 90 degrees.  Thus, 4x + 30 = 90 degrees, so that 4x = 60 degrees, and x = 15 degrees.

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