exam Maths Puzzle Numerical Ability

What is the answer to f(x)=the square root of x and then plus 2?

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exam Other Question

please help me factor as completely as possible
5x^3y-15x^4y^2 i know i have to find the gcf first 5*15=75 but i dont know what to do after that.
please help

6x^5(4x^2)



4x^2(3x)^3