Complementary angles are two angles whose measures add up to 90 degrees.
Let's check each of the given pairs:
-
17° and 73°:
- \( 17° + 73° = 90° \) (This is a complementary pair.)
-
120° and 90°:
- \( 120° + 90° = 210° \) (Not complementary.)
-
73° and 34°:
- \( 73° + 34° = 107° \) (Not complementary.)
-
120° and 17°:
- \( 120° + 17° = 137° \) (Not complementary.)
Therefore, the correct response is:
17° and 73°.