Ireally need
edit: // i dropped my phone and it went to english thats why it ain't on math.

The answer would be 15.

The first equation would be ∠1 = 15°

Then the second equation is ∠2 = (3 * 15 + 30)° which simplifies to 75°

And since complementary angles need to equal 90° to be true we have to add both angles. So, ∠1 (= 15°) + ∠2 (= 75°) = 90°. Now that we know they equal 90°, 15 would be the answer to your problem.

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hope this : )

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