- What are some solutions for 2w+4x=-7?

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Prove the identity: 6 tan theta over 1+tan^2 theta=3 sin 2 theta? How many atoms does Ca3(PO4)2? What will be the concentration of the first ion that precipitates ( or ) when the second, more soluble salt begins to precipitate? How many mL of 0.2 M HCl(aq) are needed to neutralize a 285 mL solution of 0.9 M Ba(OH)2? My home has 220 V ac SUPPLY i NEED TO BURN 6 led bulbs 20 watts each for 6 hrs.Suggest suitable inverter and battery?