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Since you have two angles that measure 45 degrees. Those 2 equal 90 degrees altogether. Since a triangle measures 180 degrees, you take 180-90 because you already have 2 angles and are trying to find the last one. Then this makes the last angle 90 degrees.
Answer:
sorry I'm not the best with math and sorry if I just waisted your time... :)
It’s: -31
when you are simplify this expression you get -31