Two Chemistry Homework I Need It In 4 Hours

I also need this question, so it is two homework + one question.

A galvanic cell is constructed with a copper electrode dipping into a 0.015 M solution of Cu2+ ions, and a magnesium electrode immersed in a solution with an unknown concentration of magnesium ions. The cell potential is measured as 2.79 V at 25 °C. What is the concentration of magnesium ions? (numerical solution: 2.9×10-5 M)
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