Let points: A(a+5; 2), B( 0; -4), C( 3;10) is a real number. 1 . 1Calculate the length of BC 1.2 Write the equation of the straight BC 1.3 Write the equation of mediator BC Find the value of a, knowing: 2.1 Points A, B, C are collinear 2.2line AB is perpendicularly to AC
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