- PLESASE HELP ME WITH THIS MATH QUESTION!!!?

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An electric current is power,how can it be converted to energy? Why is space considered a vacuum,that is something with no air or gas and light? What is the volume of a cylinder with a diameter of 1 foot and a height of 14 inches? Write balanced half-reactions for the following redox reaction:
4Zn+2(aq)+AsH3(g)+4H2O(l)→ 4Zn(s)+H3AsO4(aq)+8H+(aq)? What is the nth term of 6,912,15?