Weegy: A pair of angles are complementary if the sum of their measures is 90 degrees.
If the two complementary angles are adjacent (i.e. have a common vertex and share just one side) their non-shared sides form a right angle. MoStWaNteD|Points 2653|

User: -7 * _____ = 1

User: Fill in the blank with the appropriate number.
____ - 39 = 0

Weegy: 39 - 39 = 0

User: Fill in the blank with the appropriate number.
-7 * _____ = 1

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