ANGELINA C. answered 09/21/18
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BSE - Major in Mathematics with 30+ years teaching experience.
Given the points ( 3, -9 ) and ( 3, 10 )
Midpoint ( sum of x coordinates/2 , sum of y coordinates/2 )
Midpoint ( ( 3 + 3 ) /2 , ( -9 + 10 ) /2 )
( 6/2 , 1/2 )
Midpoint is at ( 3, 0.5 ) )