exam Maths Puzzle Numerical Ability

The question is: Any three points are contained in exactly one plane. I think the answer is true, but I want to make sure I can explain it correctly.

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exam Other Question

Quadrilateral FGHJ m is the midpoint of the quadrilateral
FM is congruent to HM and JM is congruent to GM . prove that FG is parallel to JH.

I don't know how to do a proof fo The sales tax is $49 for a dining room table that costs $1225. Find the sales tax rate?