math. algebra 2

I need help with this problem I do not understand how to solve this kind of problems....can someone show me and explain it to me thanx.

Find a Z-score satisfying the given condition: 82.9% fo the total area a is to the left of z.

http://www.fourmilab.ch/rpkp/experiments/analysis/zCalc.html?q=84&z=

Use the calculator. If you don't know what you are doing, see the text.

I am still at lost i do not see what am i suppost to do or use.

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  1. how to do vertex equation

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    posted by dorothy

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