exam Maths Puzzle Numerical Ability

If i have a triangle at the cordinates are B(-4, 5), C(12, 10) and A(9,-6). How do i find the perppendicular bisector side AC? I know you find the midpoint but what do you do after that?

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exam Other Question
radical x-1=3 solve show work A store has T-shirts on sale at 2 for $5.50. At this rate, what
do five T-shirts cost?
Would this be $6.25?