exam Maths Puzzle Numerical Ability

What are the steps needed to simplify this equation?
square root of 49x^2z^6

(^ is raised to; to the power of)

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exam Other Question

I am having problems with figuring this problem out and need some help

Number problem: Find two consecutive positive integers. Such that the sum of thier squares is 85.

Thank a million
factor all polynomials completely
6d2+33d-63
1-8m6
4a2-4ab-y2+b2
16y4-z4