exam Maths Puzzle Numerical Ability

is the sqrt of 77 rational or irrational?

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exam Other Question

Solve the system of equations by graphing. Then classify the system as consistent or inconsistent; and the equations as dependent or independent.

3x-y=23
3x+4y=13

HELP 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...