exam Maths Puzzle Numerical Ability

Find the root: cubic root 4 sqrt sign 81

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exam Other Question

9) The deepest point of the Indian Ocean lies approx. 24,500 ft below sea level. What is the integer that best expreses the given number?

16) -x when x = -22/83. The answer is
-2(2y-7)=2y-12+6y I am lost please help