exam Maths Puzzle Numerical Ability

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!

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exam Other Question

I would like help in finding this equation in standard form, the directrix, the p, the focus and what y would equal. I would also like a graph of the parabola to see what it would Any help is appreciated.
Simplify

3sqrt-1/8