exam Maths Puzzle Numerical Ability

how do I solve 4 over the square root of 2 +3?

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exam Other Question

What is the solution of: -x^2+x>=-20?

Answer choices:
A) x<=-4 or x>=5
B) -4<=x<=5
C) x<=-5 or x>=4
D) -5<=x<=4
Write as a single logarithm
3logx-(1/2)log(x-2)+2log(x+5)^3
PLZ help I need tis as soon as possible