exam Maths Puzzle Numerical Ability

=22/the circumference of a circle is 132 yds find the radius using pie 7

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exam Other Question

mn sqrt 72n + 2/3n sqrt 8m^2n - 5/6 sqrt 50m^2n^3

Can you please help me understand what to do? What are the steps to follow?
(e^-X)(X^5)/5! = .174785

Solve for X

Answer should be 2.5, but I need to know the steps for solving powers in equations.
Thank you.