exam Maths Puzzle Numerical Ability

Simplify and reduce to lowest terms

(sqrt)16/(sqrt)32

and

(sqrt)8+(sqrt)32

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exam Other Question

Simplify and write with positive exponents 9x ( x^-3) / 18 x^15.

Thank you for your help.

Gabriel
This is about velocity.
the path of a falling object is given by the function s=-16t^+v0t+s0 where vo represents the initial velocity in feet/second and so represents the initial