Angle pairs Mathematics Question help

Need to know if all answers are correct.   I have to get 100% on this quiz.  Please check answers and verify they are all correct. Thanks.

1.  Vertical angles:  <AFE and <CFD
2.  Complementary angles: <AEF and <DEF
3.  Linear pair: <BCE and <ECD
4.  20
5.  Angles combine to form a straight line
6.  Since it is a right angle instead of straight line, the calculation should be
4x +2x = 90
X =15

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