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

is the sqrt of 77 rational or irrational? roise's palm pirates, a manufacturer of electronic organizers, estimates that when x hundred palm pirates are made, the average cost per unit is given by C(x)=0.4x^2-3.68x+9.524