exam Maths Puzzle Numerical Ability

Any help is appreciated.
Simplify

3sqrt-1/8

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exam Other Question

Find the sum of the geometric series: 1 + 1/4 + 1/16 + 1/64...
I tried to do the series but the formula in the turorial was ocnfusing to me. Thanks for any help! Solve the following systems by graphing.
2x-y=4
2x-y=6