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A) Use the relationship between supplementary angles La and Lb. What is m La if mL6 = 121°?

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If angles La and Lb are supplementary, that means they add up to 180°.

So, if mLb = 121°, then mLa = 180° - mLb = 180° - 121° = 59°.

Therefore, mLa is 59°.
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