exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

square root of 48 - sq. root of 12 =

I am not using a specific book. I am just practicing...

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exam Other Question

Which of these ordered pairs is a solution for the equation 3x-2y=6?
(a)(0,-3)
(b)(0,3)
(c)(-2,0)
(d)(-2,-3) Please help me find the Hole and vertical asymptotes for the following:

x+2/x^2+6x+9 - 5/x^-9