exam Maths Puzzle Numerical Ability

Is this a function?

x + y = 12

a. yes
b. no
c. It depends
d. None of the above

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exam Other Question

The sixth grade class officers: president, vice president, secretary, and treasurer will be seated in a row of four chairs at the class meeting. In how many different ways may the four officers be seated?

Thank you so Much!
Find an equation of a parabola satifying the given consitions.

Focus (3,2), directrix x=-4