book Maths Puzzle Numerical Ability

i=sqrt(p/r) if p=500 ,r=25. would that make the answer 20 ?

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book Other Question

I'm supposed to graph 2y-4x<8 but dont know how to find the x and y points. A circle has a circumference of 20(pi)meters. Sorry There is no key stroke for pi. Find the radius of the circle. Thanks.