exam Maths Puzzle Numerical Ability

What is the equation of the parabola that moves the parent graph of

y=x^2 down 10 units?

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exam Other Question

If x the sum of all prime factors of 38, and if y is the of all prime factors of 84, what is the value of x-y?

Answer is 9.How?
This is supposed to be an rational expression.

The volume of the box is represented by (x^2+5x+6)(x+5). Find the polynomial that represents the area of the bottom of the box.