- How many shaded squares will there be in Sierpinski's Carpet at stage (iteration) 9?

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Whats is n2+n2? Can someone help me with this math question? It is in the photo? Proofs about Bijections? What does the chemical equation mean on the microscopic and macroscopic level?
ZnCl2(aq)+Na2S(aq)=ZnS(s)+2NaCl(aq)? Calculate the mass of MgCO3 preciptitated by mixing 10 mL of a 0.2 M Na2CO3 solution with 5.00 mL of a 0.05 M Mg(NO3)2 solution?