exam Maths Puzzle Numerical Ability

Find the equation of the parabola described: Focus at (0,2); vertex at (0,0). Graph the parabola and the directrix. Please explain. Thanks

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exam Other Question
why is it that a negative plus a negative equal a positive Find the greatest common factor for the following sets of terms.

12a³b², 18a²b³, 6a^4b^4