exam Maths Puzzle Numerical Ability

Find the vertex and the axis of symmetry for the parabola with the given equation.
y=5x^2-30x+47

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exam Other Question

Find the meand and the median
-5,-2,3,7,12,15
I need help with this problem, it is multiplying and dividing factorials.

In case you cannot tell:
/= Division
*= Multiplication

6!/2!4! * 5!/4!1!

Thank you!