exam Maths Puzzle Numerical Ability

sqrt((5-sqrt20)^2)+ (sqrt(sqrt20-5))^2

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exam Other Question

For all x=0 and y=0, (3x^3y^3)/xy=?
Multiple choose answers are
A. 9x^3y^8
B. 9y^4/x
C. 9y^4/x^2
D. 9y^5/x^5
E. 9y^7/x^5
What is the right answer Write an equation of the line that passes through the given point and has the given slope

(3,1), m+4