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
i need to find the diaganol of my computer monitor using a^2+b^2=c^2
L=13"
W=8"
D=???? Marginal cost: $90; 150 items cost $16,000 to produce.